hello all im new to this tread and I was having problems with my grand prix misfiring. I recently replaced the pcv valve, spark plugs, wires and cleaned the throttle body i Keep hearing that it could be my coils i just want to get other options before i decide to replace them. When I start the car its turns on quick but shakes while idle when i give it boost like getting on the highway is when it begins to misfire mainly between 50-60some one please help
thanx oh and by the way its an 07 3.8l sc
