My car has a misfire on cylinder 4. Here's whats been done or replaced: Plugs(twice),wires(switched around and still misses only cyl 4)injectors (swtiched around ,still misses cyl 4) fuel filter was checked and replaced(old one was fine),heads were off and resurfaced/magnafluxed, new head gaskets etc,replaced pcm with a new one(still misfires on 4,switched ICM (twice and still misses),replaced and switched coils(twice and still misses on 4) Cam position sensor replaced and still misses, fuel pressure is fine,(misfire goes away or at least seems to upon normal driving),vacuum lines all check out fine,.... I'm extremely close to dumping this car. I've got 11 thousand tied up in it from the time I bought it a year ago august til now..... Any help would or insight would be appreciated. The car is sitting at a shop right now and I've basically told them they can have it until they find would could be going on....