Hi, I have a 2004 Cadillac CTS 3.6 we have a code p0304 which is misfire in cylinder 4 all spark plugs coil packs and fuel injectors are replaced yet the car still shakes in idle. We also replaced all 4 02 censors and the two cadalytic converters. We are stumped any suggestions would be appreciated
Cars & Trucks - Cadillac
Answers & Comments
If car shaking while idle can be vacum leak .You can fill plastic bottle with water and pour over vacum hoses.If engine runs worse theres your problem
You may have a wiring problem between the ignition module and the C4 injector (a connector issue at either end or with the the wire itself), or the ignition module may be faulty.