ChrisUlrich

Could the PCM be at fault only in closed loop? Could that part of the memory table be effected only? Runs great in open loop, but terrible in closed loop. Think it's PCM related as far as the PCM itself goes?

Dave89IROC

whats it doing?

ChrisUlrich

Once car reaches closed loop, it begins to stumble and fall on it's face. Will only stay on if I give it gas.

turbo_Z

Yes the problem is most likely PCM related but not anything physically wrong... you need to figure out whats going on when the car goes into closed loop. Basically look at the BLMs and see where most of them range so as to give you and idea what the PCM is doing.

Also, start by putting the stock throttle body back on. I see you have idle problems and keep screwing with the TPS. Take all that out of the equation by going back to the stock TB. A 58mm doesnt require any tune modifications where normal driving is concerned.