I replaced all injectors, checked all wiring, and Im still getting a dam DTC-18 injector circuit... the guy who reads the codes for me said he thinks it could be opti, the ignition switch is fine.... When I start it and its been sitting for a few and engine cold, I turn it over but have to give it gas to keep it running, its seems as though its only firing on 4 cylinders or so.... extremely rough, if I keep RPMS up for about a min or 2 it corrects itself and runs fine, Ive been able to recreate this problem, and while doing so I tested all the injector wiring, all was good... is there anyway to test the opti or PCM? I really need help here guys thanks!

 

oops I just realized I forgot to tell you guys its a '95 Z M6

 

How's spark..? Col/plugs/plug wires..? I've hard that, they checked them, said it was fine..did it MYSELF, found 2 cracked plugs...replaced, vroom vroom, back in business!

 

Yeah I just put new plug wires on last week and new plugs in about 10,000 miles ago... this problem just started about 2 months ago...