my friend has a 94 M6 Z28. he bought it about 1 month ago. the engine since he bought the car is running rough at all RPM's and there is big time of lost power. he did a tune up cleaned injectors, new spark plugs, new spark plug wires, new optispark, new O2 sensors, rockers were adjusted right 1/4 turn, and still that thing doesn't want to run right still running excatly the same way not even improved by even a hair. what would be that? coil? some defected injectos? by the way the PCM showed the follwing DTC's :

DTC22, DTC29.

any one can help?

 

another step in tuning up an engine for me is seafoaming the hell out of it...suckin it in the intake, in the oil, gas ...all that...

 

DTC22 = TPS low voltage....make sure the TPS isn't sticking and that the wiring going to the TPS is in good condition (no broken insualtion).

DTC29 = AIR pump...just get rid of the thing...he's got a 94, so it shouldn't throw any codes at all.

Hope this helps!!