still trying to figure out the problem with this car its alarge street port 6 port it sputters from 3900 all the way to the shift point i have replaced the maf,tps,fuel pump and filter spark plugs fuel pressure regulator. my aux ports are working, no codes being displayed. I AM CLUELESS!!!!!!!!!!!!!!!!!!!!!!!! im in oxnard ca if anyone can help me or find me a shop to bring it into

 

Sounds like your secondary injectors aren't right.

 

i have checked and replaced them with others that were in spec and the original set was also fine

 

I'm guessing they aren't being activated properly then, perhaps an ECU problem.

 

^Sounds something like that^

 

with the ignition on you should see 5 volts on the injector plugs. check that out

 

sounds likely to be a ground problem, the ECU's main ground is under the throttle body on top of the engine, it's very important. Also check for a clogged catalytic convertor.