Misses badly from Idle to high speed
Hello all, I have a 2006 g6 GTP and I ab so looootly LOVE this car. However, recently it started missing badly. It comes and goes. I took it to the shop and they said "cant fix what we cant find". THAT DAY it wasnt doing it! It is a bad miss in #4 cyl from idle to high speed. At 60 mph it feels like your on a bumpy road but its the engine missing. It is a 6 speed manual and it happens thru every gear. But it DOES accelerate okay (kinda???)........... my shop guy said maybe coil pack or ign module. He checked wires and said they are ok.............................HELP PLEEEEEEEZ!!!