I have quite a big problem with misfiring. While driving on high rpm my engine is misfiring (only sometimes). No matter if boost is high or low. What do you think? My spark plugs are normal NGK (6000 miles old). What could be the reason?

RacerRT said:How are your spark plug wires? How long since they have changed? It sounds to me like you could have an arcing problem, or clean up your terminals on your coils, when you are experiencing constant, close pulses, you have a misfire, something is not making a complete conduction. My first guess would be wires.
RacerRT said:Wire Harness, same damn thing