I have a 4.8L engine I am running with a 2002 LS1 pcm in my 93 c1500 truck. The thing is running pretty lean, 14.8+ AFR. I have tried everything I can think of to change the closed loop AFR but it will not change. I need to get it about 14.0 since we have nothing but 10% alcohol fuel year round here in the Dallas area now. Anyone have any suggestions or willing to tweak this tune so I can try it? Open loop, speed density is my last resort.
Thanks,
Greg