Is anyone else getting a rough idle

When my car is sitting and just running the idle makes it seem like the motor wants to kill off and the car shakes a bit.

Is anyone else getting the same?

Yeah, mine too. The PCM is bad. I'm curious, is yours an 888GT? Mines #318. Makes me wonder if there's a bad batch of PCM's going around. I was having a hard time dealing with being the "only" one with a problem..Like bad Mojo or something....I'd have it checked ASAP. Mine's only got 200 miles on it. Glad I didn't take off on a raod trip to Cali!!

GET A TUNE!!!!!!!!!!!! J/K

take to a dealer and get it checked out... it seems like couple of other g8's are having the same problem (from what i have read)

you wouldn't want it to stall at light just before you eat up a hemi would you?:yumyum:

Mine has a slightly rough idle, but not to the point of stalling.

Mine has a slightly rough idle, but not to the point of stalling.
Same here - kinda like it drops a cylinder every now and then.

Just picked mine up and noticed a slight hiccup at idle - nothing I am too concerned about at this point though.

I got my G8 about a week ago and it is doing the same thing......I have #39 of 888

I got my G8 about a week ago and it is doing the same thing......I have #39 of 888
You ALL need the $66.00 exhaust mod. LOL

I posted this a while back and several said that it was "normal" for gm V8's and that a couple of people said this occasional hiccup at idle even happens in trucks and vette's

relax....let it break in.:popcorn2:

So you're saying as soon as it breaks in the rough idle goes away? I'm not concerned about it, but just saying relax let it break in isn't going to fix an idle.

Yea i had a 2007 6.0 vortec max

gave it back for being in shop for more than a month straight because 1. airbag 2. ecm 3. then they f**k up my door in a bay 4. took 2 weeks in body shop 5. went back and took 3 1/2 weeks in service and you guessed it... i said f u guys take it back and got back my deposit back

Anyways had to let that out :cursin:

But it had that little stutter once and a while when it was idling.... nothing to worry about... (NO IT WASNT THE ECM) im guessing its a lot of gen IV's....

by the way off topic that truck was the prototype fitting for the FIPK K&N intake... and they dynoed it... 301 hp STOCK and 309.8 with intake....
FYI 6.0 "L76" 4-speed, 3.73 gears...

Mine's a little choppy at idle - nothing that makes it feel as if it's going to die, or anything. Just feels like a mildly-cammed engine.

Am I the only one that thinks this shouldn't be happening in a brand new car?

Mine's a little choppy at idle - nothing that makes it feel as if it's going to die, or anything. Just feels like a mildly-cammed engine.

Yup - ditto

Am I the only one that thinks this shouldn't be happening in a brand new car?

Maybe it shouldn't be happening.. But every GM 6.0 Liter V8 engine equipped vehicle I own (G8 and 3/4 Ton Silverado) as well as every other car I've ever been in had the exact same feel at idle. You think that's bad, go sit in a '00 Viper... Jesus... Felt like the car was about to vibrate apart.. But once you take off it stops and everything smoothed out.. Sorta...

Am I the only one that thinks this shouldn't be happening in a brand new car?

You are not the only one who thinks that a brand new car should run perfectly. Mine is still in the shop for a new PCM...It better not even hiccup or right back in it goes.

I noticed mine having a rough idle yesterday as well. I need to take mine in for the airbag light and ABS light coming on anyways :banghead:

The G8's semi-rough idle is just fine with me! I like the quiet exhaust so at a stop it is a "hello driver and passengers, I'm a 6.0L small block V8 just incase you forgot" idle. :gears:

my 888 also does this a little at idle.

mine to. a little shaky. barely noticeable.

It's called, "nature of the beast".
lol

Mine shakes a little also. Something im not used to in a stock lsx motor.

Well, ours does it as well. It doesn't feel like it's going to die or stall out. The RPMs stay at the same point just a vibration. At times it's more noticeable than normal.

I am guessing this is normal because if it's not there are a whole lot of us with a problem. LOL

Well, ours does it as well. It doesn't feel like it's going to die or stall out. The RPMs stay at the same point just a vibration. At times it's more noticeable than normal.

I am guessing this is normal because if it's not there are a whole lot of us with a problem. LOL
Huh! Mine has always idled so smoothly that I have to look at the tach to see if it's running.

Must be that famous $66.00 exhaust mod. :p

My GTO had the same idle. Pretty normal for GM V8s

Mine's a little rought when cold. But, not bad enough to worry about.

my g6 had a rough idle, and every time i brang it in it would be fixed for like a week and then just be rough again, pretty sure its something about Pontiac's pcm's

Is anyone else getting a rough idle

When my car is sitting and just running the idle makes it seem like the motor wants to kill off and the car shakes a bit.

Is anyone else getting the same?



I have 1,700 miles on my #677 of 888. I don't think it is a "break-in" issue. Car runs great otherwise.

Relax, guys. My GTO LS2 has a slight shake at idle -- probabably more noticible with the A6 since it has the torque converter load. People take their Harley's back into the shop because the DON'T miss at idle.

I noticed the occasional rough idle when I test drove a G8 last week. This is a complaint that GM has heard from people with 6.0 trucks for a while now, and is caused by the idle RPM being set too low in the factory tune. Some are worse than others and stall, some only shutter a little, and many are fine. The idle only needs to be raised by about 50 rpm to smooth things out, and can be done at the same time as a tune.

I noticed the occasional rough idle when I test drove a G8 last week. This is a complaint that GM has heard from people with 6.0 trucks for a while now, and is caused by the idle RPM being set too low in the factory tune. Some are worse than others and stall, some only shutter a little, and many are fine. The idle only needs to be raised by about 50 rpm to smooth things out, and can be done at the same time as a tune.

How does one raise the idle about 50 rpm? How much would it cost to have it done with a tune?

Even my GP GXP has a bit of "rough idle" and it's got some pretty soft mounting bushings.

Of course, it has stalled about twice now in almost 30k miles and 2.5 years.

My #245 GT shakes at idle and I was wondering if there was an issue with the engine. So "Penguin" .. what's this $66 exhaust mod you keep speaking of?

I have #798/888 and it also idles a bit rough....

So does #608.

meh, I only notice it when the car is on park... once in drive it pretty much goes away...

Mine is not one of the 888 but it does it as well.

could it be the cam lope?
i remember my 04 gto used to have a shudder at idle but always thought it was the stock cam... thats also what ive heard from other goat owners..
maybe same with the g8?

I'd like to know more about this as well. If it's just the cam lope, then that's not a big deal. If it's like the problem I had with my 04 GTO, then it is significant. My GTO, when the weather was hot, vibrated like a big magic fingers bed when idling in "D." In 100 degree heat it was so bad that everything inside the car would start audibly vibrating and humming. Dealer couldn't (or wouldn't) fix it and it was a SmartBuy, so I just gave it back at the end of the term.

Is this a serious problem? Id like to now if it is causing any serious problems that may cause the engine to stall or something

Mine does it, too.
She's fine, though
:p

I never new automatic cars could stall :cool:

Is this a serious problem? Id like to now if it is causing any serious problems that may cause the engine to stall or something

I do not consider it serious at this point, just a "bump" every once and awhile. It is worse in park than drive for me, as I believe has been mentioned elsewhere.

Anyone took a look at the Crank shaft pulley while idling??? It is all over the place. Maybe the design. But it is the integrated harmonic balancer/crank pulley unit.

I never new automatic cars could stall :cool:

You can stall an auto. Shift from forward to reverse while still moving (or vise-versa) or let it roll backwards quickly on a steep hill in drive and it can happen. Or if the idle is too low it can stall out. Seeing as this topic is about vibratons at idle, that's likely what the poster was worried about.

Every EFI car me/my mom & dad have owned does a little shutter at idle. I have never had a stall because of it, though. my 03 silverado did it, 06 GTO does it, and my G8 does it. G8 is least noticable...probably because the cam is slightly smaller than the truck and much smaller than the goat.

I got my G8 about a week ago and it is doing the same thing......I have #39 of 888

impossible, my vin ends in 988039.

My #245 GT shakes at idle and I was wondering if there was an issue with the engine. So "Penguin" .. what's this $66 exhaust mod you keep speaking of?
Sorry KM,
I just saw this. I'm not sure I should start on the $66.00 exhaust mod again as it created much hysterical laughter last time :p

All it involves is replacing the center resonator (oval) with 2 straight pipes. It doesn't do much but give the exhaust a nasty popping sound and a bit more noise at WOT, but it is what I wanted since I didn't want any drone, and it doesn't sound like your average "mellow" V8 tone. It's just NASTY! I'll have my VMS ECM tune by this time next week, and then see how it sounds.

impossible, my vin ends in 988039.


Let me redact my previous statement.... my vin ends in 988038. I have #38, my apologies.

Mines runs with a small miss. Could it be the active fuel management trying to save gas?

No. AFM will not activate until approximately 25 mph. Does not work at idle.

Mine has a slightly rough idle, but not to the point of stalling.

Same here

It seems idling is kinda rough on LSx motors. Wonder if the MSD multispark coils would help? They have LS1/LS6 and LS2/LS7 kits. "The result is smoother idle..." amongst other claims. Which kit would fit ours?

It seems idling is kinda rough on LSx motors. Wonder if the MSD multispark coils would help?

Its because the idle is set VERY low. bump the idle 50rpm (from what I've read on here) and the rough goes away.

I'm not sure if it's the rpm. I notice when the car is just started early in the morning on cold start, the rpm is a bit under the 1000 mark, until it warms a little ( a couple of minutes) then goes to just over 500. I feel the same subtle vibrations when the rpm is close to the 1000 then when it is at 500. I don't think it really is anything. Just the feel of the engine running. Haven't had any problems with the engine at all.

Its because the idle is set VERY low. bump the idle 50rpm (from what I've read on here) and the rough goes away.
The idle is set quite low, but my car (888 #748) idles smooth as glass. Now I'm afraid there's something wrong with it. Does anybody know of a lumpy idle mod? :p

Mine does it too, I think its just the healthy cam. My 05 CTS-V had the same thing, never complained about though and it was fine for 20k miles.:)

I wouldn't say mine is rough, but I wouldn't say it was perfectly smooth either. Every now and then I'll feel a small 'jerk' (for lack of a better term), but nothing I would call a constant vibration or a serious problem.

The 6.0 motor has a decent size cam, and that will cause a bit of a lopey idle .
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Panther Blk, Sport, Prem. Pkg Sunroof, Magnaflow cat backs, Rotofab Cai

I will be posting Dyno results of before ,and after results , on both the Magnafow catbacks and Rotofab's CAI. This will be done on a Mustang chassis dyno within the next few weeks. I will post the results

The 6.0 motor has a decent size cam, and that will cause a bit of a lopey idle .
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Panther Blk, Sport, Prem. Pkg Sunroof, Magnaflow cat backs, Rotofab Cai

sorry if this question is dumb but what is a cam?

sorry if this question is dumb but what is a cam?

Quick answer, the cam makes the valves open and close

Long answer, see below:

http://en.wikipedia.org/wiki/Cam_shaft

The rough idle you guys are talking about seems to have shown up in my G8 GT. My whole car will rock a bit like the car is getting hit by wind gusts while sitting still. The tach needle moves ever so slightly also. I've had other GM V8's, none of them idled super smooth. However they kept a steady idle and this car seems to dip a bit more than I'm used to. I was sitting at a light yesterday and I could see and feel the car rocking from the idle changes. Then at other times it idles just fine. It was glass smooth the day I picked it up, ugh.

Our car also has a rough idle but it doesn't bother me. I've had cars with very large cams and it's smoothe compared to those. lol

Mines runs with a small miss. Could it be the active fuel management trying to save gas?

It idles on eight cylinders so it shouldn't do that.

However you may feel a judder through the wheel and floor of the car at cruise as it switches from eight to four cylinders and back.

This is why I want the LS3 (no cylinder deactivation and the bull**** that goes with it) or I would tune it out of the L76 model if that's what I end up with.

If it's the last 3 vin #'s I'm 587 and it idles rough.

No V8 should do that.
We test drove it 3x and put the first 42 miles on it. no problem.
The minute I got it home rough idle.
I've already reported it.
I have about 200 miles on her now.

If it's the last 3 vin #'s I'm 587 and it idles rough.

No V8 should do that.
We test drove it 3x and put the first 42 miles on it. no problem.
The minute I got it home rough idle.
I've already reported it.
I have about 200 miles on her now.

I had the same thing happen. The first day it ran so smooth that my buddy asked if it was even running. The next day.. it felt way shaky. It has not stalled, and actually the idle for the past few days has been better, but still not glass smooth like the first day I got it. It had 41 miles on it when I picked it up... 41 easy going test drive miles. I'm at about 420 miles now since last Tuesday. Yeah I've been driving no where, just to drive. Damn gas prices.

i've noticed that my gt actually idles smoother if i leave it in Drive rather than put it in Park...anybody else notice similar? i guess the load on the engine helps keep it from shaking??

Maybe VMS or another tuner can speak to this... I know you can tune the DOD activation. Would it be possible to set the DOD to turn on when idling in park?

I spend a lot of time sitting in the car and in the Texas summer A/C is essential, but I'd rather burn as little fuel as possible. If I could turn it down to 2 cyl in park I would.

If I could turn it down to 2 cyl in park I would.

and can't even imagine the shakes you'd get with a v8 only running on two cylinders!

Here is my issue and question.
Issue:
I purchased my G8 GT a week ago today. For the first three days it idled extremely smooth at exactly 500 RPM. On the fourth day I notice the idle is no longer smooth, AND that the RPMs are slightly elevated. It's at the dealer now. So far they say there is nothing wrong with the car, but I insisted they drive the car a couple days and look harder to find the issue.
Question:
Has anyone noticed the same two changes at one time? By that I mean, a change to uneven idle AND slightly elevated RPMs. If yes, were you able to get the smooth idle back?, how?

Side note/questions, does this car have any built in programming to detune the engine slightly for the first few miles? Any feedback regarding fuel octane (or quality) vs. idle?

Thanks for any advice,
Don

between the cam and the AFM and the TQM these things are detuned just plenty...drive it nice, go hard a few times, let everything set up.

So what's the verdict on this?

I took my '09 to the dealer yesterday for the rough idle. They said it's normal. It has 1300 miles on it, and has idled like this since the first weekend I brought it home. I have tried 93 octane and 87 octane, and there is no difference.

Has anyone had any success in getting the problem fixed?

Me too, even with a tune. But you can say the car literally rocks.

Might be bad gas - try laying off the White Castles......

Actually my car does it as well (2009 GT), I am waiting to see how it breaks in (mine has 250 miles on it - 2009 - got it a week ago).

My 1999 130,000 mile automatic Camaro Z28 with the 305hp LS1 that I traded in never had this issue - I am not buying the 'typical ho V8'.

I noticed it in the test drive car as well as the one I purchased. Doesn't bother me much, but I asked the dealer's service manager out of curiosity. He said they all seem to do it at idle. He was convinced it was just the cam. He may be correct since at least in mine it seems to smooth out if I add as little as 100 RPM.

1200 miles in a month and half. Never really left town. Nearest town 25 miles, nearest city 150 miles. The car still juggles back and forth even after a touch of the peddle on the right. Might I assume this car is cammed, lot's of torque? Maybe you could get more, but if it is so, really this car rocks. Ive been in '69 gto's that shook, similar to the rock, lot's of hp and torque. Maybe you might oughta appreciate it. :driving:

9200 miles on mine...it calms down a little after some mileage. No worries. Every now and then I may get a little shutter, but not as often as when I first picked up the car.

Really, it's just the car telling you it's hungry for speed.

its supposed to. nothing to worry about. the idle calms down after the car is broken in.. but the shake wont go away. pontiac wants it there so it feels more sporty, like the old muscle cars.. if there were an issue, esspecially with a misfire, the CEL would come on.

I expected more refinement from GM. Trans also shift harshly when cold.

pontiac is not a refined company. pontiac motorsports man.. they are power/technology/style.. every performance car they put out will be focused around the old days, when a cammed car shook the streets and dropped the panties.... you want refinement.. your in the wrong brand.

the g8 is pretty well refined, i like the ride much better then my bmw 330i. sure it shakes a little at idle and the trans shifts a little more firm then other cars. but wow its a great car.

Mine does this as well, nothing major just able to notice it. I am glad that at least it seems to be consistent with everyone.

go caps I just about soaked my keyboard with soda on your "shook the streets and droped the panties" line. lol I gotta go to town and see if I can drop some panties....lol

Just picked up my 09 GT in Pacific slate metallic and noticed the rough idle on the first turn of the key. I was sensitive to it only because we just got rid of a Saab that started rough idling to the point that it died repeatedly. i thought "Oh brother, here we go again".

I'm willing to let it ride for now, but I never noticed it on the car we test drove.

I expected more refinement from GM. Trans also shift harshly when cold.
Yeah trans holds the gears really long and shifts harsh when the tranny sump temp is low.

The trans tuning from the factory is a piece of crap, IMO. The torque management really sucks, even on everyday shifts. You can definitely feel it pulling timing, thus the harsh shifts...it's really annoying.

Plus I hate the manual mode because it takes forever to shift and some of the downshifts are very jerky.

Over 2000 miles now and mine still does it. I'm going to mention it to my Dealer and see what they can do.

I just picked mine up today and I am getting the shimmying when idle too.

There was a TSB for all the other GM V8s a while ago to re-gap the spark plugs to max to reduce an idle shake/vibration. I am not sure if that applied to our engine as well or not. I will ask my mechanic today and see if I can figure out what the proper gap should be.

I can't believe there are 5 pages of comments on this...no doubt most of you have not owned a car like this. THERE IS NOTHING WRONG...its normal...your dealer isn't going to do a darn thing for you. If you didn't want to feel the idle of a LSX v8 engine you should have bought a camry.

Yeah I'm pretty sure there is nothing wrong with it. These engines have been around for quite some time and are very reliable.

I can't believe there are 5 pages of comments on this...no doubt most of you have not owned a car like this. THERE IS NOTHING WRONG...its normal...your dealer isn't going to do a darn thing for you. If you didn't want to feel the idle of a LSX v8 engine you should have bought a camry.

I was thinking the same thing. It seems the G8 is the first high displacement pushrod engine muscle car a lot of people here have ever been in.

Ya got me!!! It is, lol

Mine idles roughly, especially when it's cold. It also has some surge when it's cold. I like it, makes it feel like a hot rod of my youth. Wanna get really freaked... think your tach is nice and steady at idle...turn on engineering mode and watch the rpm's in the DIC. Here come the post, LOL

There was a TSB for all the other GM V8s a while ago to re-gap the spark plugs to max to reduce an idle shake/vibration. I am not sure if that applied to our engine as well or not. I will ask my mechanic today and see if I can figure out what the proper gap should be.

Rough idle can be cured on any car by gapping the plugs to exactly 2.5 centimeters.

I can't believe there are 5 pages of comments on this...no doubt most of you have not owned a car like this. THERE IS NOTHING WRONG...its normal...your dealer isn't going to do a darn thing for you. If you didn't want to feel the idle of a LSX v8 engine you should have bought a camry.



:mswerd:Maybe other vehicles have a more severe "rough idle" than mine but I would classify my vehicle as normal. It's no inline-6 but far from "rough". Nothing wrong w/ a little lope at idle, IMO. ;)

+1, but it does not bother me, If anybody tries the gaping and it works post the results!!

Now that the weather is getting warm, the rough idle is almost non-existent once the engine has warmed up. It seems to be present during the colder months. But nothing to worry about. The engine is not as refined as my last car, the Accord V6, but this car will out handle the Accord anytime, anyplace. It is also faster but does guzzle more gas.

I can't believe there are 5 pages of comments on this...no doubt most of you have not owned a car like this. THERE IS NOTHING WRONG...its normal...your dealer isn't going to do a darn thing for you. If you didn't want to feel the idle of a LSX v8 engine you should have bought a camry.
Just like the man said, there's nothing wrong with our cars. As a matter of fact, my wife would love to have MORE shake/feel at idle like our 04GTO(sold). That shake at idle was the first thing she talked about at the test drive:driving: of our G8. :)

I can't believe there are 5 pages of comments on this...no doubt most of you have not owned a car like this. THERE IS NOTHING WRONG...its normal...your dealer isn't going to do a darn thing for you. If you didn't want to feel the idle of a LSX v8 engine you should have bought a camry.

:iagree: AMEN BROTHER!!! We've been stompin stangs and eatin rice with our lx powered vehicles since 98. Rough idle, what? That's the big ol stock cam that you have there in the block sending lift up to actuate your valves. That so called shimmy, is a great thing :us_flag:. Enjoy your gen IV L76 pushrod torque monster.


With that being said, I am aware that some of our G8's idle low. That may be the rough idle that some speak of. However, that is easily corrected by having the commanded idle raised a few hundred rpm.

sorry guys, but if it was the cam that was making the idle rough...it would idle rough all the time. so, i'm not buying that argument. mine only seems to idle roughly when it's not quite warmed up all the way. i think it's a software or sensor issue myself...

Mine's a little choppy at idle - nothing that makes it feel as if it's going to die, or anything. Just feels like a mildly-cammed engine.

I feel the same way -- and I like it. It doesn't feel unhealthy at all. Along with the great overrun noises the LS3 makes (best of any car I've ever driven) I feel like it's part of the engine's character.

It's not the cam, the stock cam is wimpy. It's just the way the cars run. A good tune will improve it greatly.

Let's see:

Vehicle idles "rough" during initial cold start. After reaching the normal operating temperature, it idles smoothly. What's the problem? My vehicles idles the same ("rough") regardless of operating temperature. I only find it noticeable when sitting @ a stoplight, drive thru, etc. and making an effort to feel/notice it.

My GXP has the tiniest rough idle. You can't always feel it but once in a while you do sense a few 'bumps' ... especially if you have your hand on the shifter.

Love it.

Now that the weather is getting warm, the rough idle is almost non-existent once the engine has warmed up. It seems to be present during the colder months.

This could be A/C related. The idle RPM is raised when the A/C is on so the higher idle smooths-out the shakes. In the winter with the A/C off, the idle is low. Mine shakes much less when the A/C is on.

Normal... some have changed for 87 to 91 octane, and have noticed a change at idle... I have not however.

It's not the cam, the stock cam is wimpy. It's just the way the cars run. A good tune will improve it greatly.

I went from a rather rough idle and startup to a butter smooth startup and VERY little rough idling after the VMS tune. Very happy!!

I too have extremely rough idle first thing in the morning. If I don't let it idle for 10 seconds minimum it has almost cut out on me. Once I'm up to operational temps it calms down, but it's still rough for a car in this price range. I'm scared to put a tune on it for fear if it's something really wrong I'm screwed.

Normal.

Your engine is not going to blow up. It is not going to "cut out".

It's what happens when you have a 6 liter engine that is capable of putting out very strong torque numbers. Again, maybe you guys haven't been in cars with high displacement pushrod engines before... It's just a reminder of what you have under the hood. Get used to it.

You can tune it if you want to lessen it, though I have some suspicion that there is some placebo effect involved, since after owning the car for a while, at this point I barely even notice the rough idle at all, so people with tunes may still have it and may have just gotten used to it. Who knows.

Either way, I love it, and it's just one of the little things that makes me love having that monster of an engine sitting in front of me (which is, after all, a very major reason I bought the car).

Normal.
It's what happens when you have a 6 liter engine that is capable of putting out very strong torque numbers. Again, maybe you guys haven't been in cars with high displacement pushrod engines before... It's just a reminder of what you have under the hood. Get used to it.


huh? i've owned a number of big displacement OHV v8s...and none of them had the obnoxious idle that the 6l in my g8 displays on occasion...

huh? i've owned a number of big displacement OHV v8s...and none of them had the obnoxious idle that the 6l in my g8 displays on occasion...

my mustang had a rough idle from the factory and got even worse with my tune and mods. its to be expected. your driving a performance sedan.

whatya want?

i ain't drinkin' the kewl-aid guys...no car should feel like it's gonna stall out when you pull up to a stop sign or red light...not in the days of fuel injection and computer control.

i ain't drinkin' the kewl-aid guys...no car should feel like it's gonna stall out when you pull up to a stop sign or red light...not in the days of fuel injection and computer control.

considering every G8 does it...I don't know that you have much of a choice lol

:popcorn2:
Not sure why this thread is still alive, as stated above many times, the whine is normal.

:popcorn2:
Not sure why this thread is still alive, as stated above many times, the whine is normal.

You mean the rough idle. :p

You mean the rough idle. :p

Oh geez. They need to make that EDIT button bigger.

I had my car custom tuned and got the TQ management turned down to 75% and also changed a lot of other variables and I tell you what...

it's like night and day. I don't think I can go back to the stock tune. This car is so much more fun to drive with the tune. The tranny lag is non-existent. It pulls when it shifts so it feels, so it thrusts you back into your seat...I'm running a 93 Race tune courtesy of Tillman Speed. Been going there a few years now and those guys can the tune the hell out of any car, whether it's old or new.

Just got mine last night and noticed it also. Good to know it is normal and there's not something wrong! :)

I had my car custom tuned and got the TQ management turned down to 75% and also changed a lot of other variables and I tell you what...

it's like night and day. I don't think I can go back to the stock tune. This car is so much more fun to drive with the tune. The tranny lag is non-existent. It pulls when it shifts so it feels, so it thrusts you back into your seat...I'm running a 93 Race tune courtesy of Tillman Speed. Been going there a few years now and those guys can the tune the hell out of any car, whether it's old or new.

I just got mine the other day and only did 50 for fear that 75 would be too harsh. So you like it at 75%?

I just got mine the other day and only did 50 for fear that 75 would be too harsh. So you like it at 75%?

Love it!

It's sweet how you can feel the torque pull. Really was surprised of the amount of torque this car has!!!!

Also I have noticed when I'm in manual mode, and I come to a stop, by default it goes to the 2nd gear, but no I can downshift to 1 without that tranny clunk that normally occurs when you do that from the factory. The tune must have taken care of that as well.

Gotta love it!

I noticed when I first drove mine- seems like a nice lope to me. Wifey (her car) thinks the car shouldn't do it. I took it in just to check it out.

Tech says this is standard for all 6 liter GM motors. Some cars/trucks feel it less some more do to different types of motor mounts. He said don't worry about it.

Mine went away with the installation of my CAI, X-Pipe, and Exhaust upgrades. I think it may be a breathing issue, bad fuel, PCM? I never seemed like it was going to stall...it just chugged a bit until I put it over 2, 000 RPM.

Fixed now though!

Good Luck!

One of the first things my wife noticed about it. She said it shakes her but :D

Doesn't really bother me, although I must admit at first I wondered if it should be doing it. Been a LONG time since I have had a V8 powered car (well, except for the '70 Electra 225 sitting there waiting to be restored but it isn't driven) so I guess I've just gotten used to silky smooth V6's over the years. Drove a friends C5 (similar engine) and I didn't really notice it in his car.

I've only had the car 3 weeks or so, and already have 1400 miles on it :driving: I have been going for rides quite often it seems just for the hell of it. I'm not going to worry about it or anything of this type until after 2-3K miles. After I switch over to Royal Purple might smooth things out a tad anyway plus I have a CAI on order and a custom tune will be shortly thereafter so that might make it smoother too.

...hmm...think it's time to take a ride :D

Just get your idle raised 50-75 rpm it won't happen anymore

How do you like your Magnaflow Cat Back exhaust? Is there any "drone" around town or on the highway?

What $66 exhaust mod are you talking about? I have an 09 G8 GT. Thanks.

Is anyone else getting a rough idle

When my car is sitting and just running the idle makes it seem like the motor wants to kill off and the car shakes a bit.

Is anyone else getting the same?

It is nothing to concern yourself about. It's a characteristic of a GM 6.0 L. Earlier Vettes w/ the 6.0 do it and the G8 does it too.