09 Pontiac G8
My V6 has a rough idle and just want opinons. I changed my plugs a few months ago due to this rough idle, thought maybe the plugs were bad. Upon getting to the number 5 plug/coil pack I discovered it was full of oil. Washed it down into the engine and cleaned it real well. I put the new plug in and let the engine burn the oil out. It ran fine for till now and the rough idle returned. Im assuming number 5 is full of oil again but what i need to know is why its filling up with oil. A seal? Maybe the coil pack needs replaced? Any thoughts are welcomed!