On my black GTP. For awhile now if I go WOT, I get a **** ton of KR (like damn near 10 degrees!) and my O2s will be in the 820-850s. Now if I roll into the throttle, even go 3/4 throttle my O2s will be in the 920s with no KR but as soon as I push it all the way it goes into the low 8s and I get a ton of KR. Obviously I haven't been driving it WOT because i'm afraid of damaging the motor. I need to figure this out and fix it. I've been scanning with my Scanmaster of course.
Heres what i've done. I just swapped fuel rails because my old ones were causing a vacuum leak, swapped fuel injectors (same stock L67 style, lower mileage), new fuel filter. The only other things i think it could be is thew FPR or the fuel pump since its original with 143,000 miles on it. Anyone ever have a fuel pump do similar things? Could a bad FPR do this too? I'm baffled at this point. I don't want to drop the $$$ on a fuel pump if it doesn't absolutely fix 100% of my problem. My vac leak is fixed and good. I would of thought that would of been the problem but even after resetting the computer the problem is still there.
Any ideas? Thoughts? Suggestions?