2008 Pontiac G8 v6
hello all, This is my 1st post but I am desperate to find out what is wrong with my G8. The original problem was that when I am driving down the road minding my own business going about 65 all of a sudden my car will jump or surge. I don't really know how to explain it. I had taken it to my mechanic because check engine lights were on and they said it was probably the timing chain because it was throwing out the P0008 code. I had the timing chain replaced this week and the AC compressor which has nothing to do with the problem I'm having I'm just telling you what all I had done. I also had two oxygen sensors and I am going to have the purge valve replaced as well. Anyways I picked up my car day before yesterday AND IT drove great the 1st day, the 2nd day I was driving along and all of a sudden it jumps it is so out of the blue it startles me. She has 154,000 Miles on Her and she purrs like a kitten and has always drove really well and quiet even when they thought she was having the timing chain issue she still made hardly any noise when she was idling. I have never spent money on her besides lower control arms 2 years ago. I pd almost 4,000 the past month and I can't afford to just guess on what's going on. Any help would be greatly appreciated.