Reader'* Digest version is that the new exhaust manifold on the front (Powerlog) is more efficient at removing exhaust, causing the front 3 cylinders to flow better and run leaner than the rear 3 cylinders. He needs 2% more fuel to the front cylinders to battle this condition and even out the air/fuel ratio in all 6 cylinders. Then the tune he applies in the PCM will affect all the cylinders in the desired manner because they're all burning the same A/F ratio.

And after he does all that, he can start troubleshooting any KR that remains.

Discussing and troubleshooting KR on a car with a powerlog and no skew is pretty much pointless. It'* a known issue.

hey will would it be a good idea to upgrade to 42.5lb flow matched injectors or just stay with
the stockers?

I'd stay with stockers. I HIGHLY doubt you're outflowing them with those mods. Flow matched stockers would be a better place to put your money.

NO. Absolutely NOT. You're not ANYwhere near outflowing the stock injectors. You need to have your current PCM skewed for the front three injectors. Fix the car instead of introducing more variables.

Fix the KR via skew FIRST. Before anything else. Get the other KNOWN bugs in that PCM fixed at the same time. Don't do anything else until you do.

ok thanks

You have to remember there'* alot of guys here running 3.2" pulleys, headers, rockers, cams, etc. and are STILL running stock fuel pumps, FPR'*, and injectors.

#1 rule, don't introduce ANY other changes until you get it FIXED first, or we'll all be chasing our tails with you trying to nail this down. Nail it down as it sits, then we'll move forward from there.

good point ill do that thanks for your input

Exactly. Don't fix what isn't broken, especially when there are more important issues that need to be addressed.

My '99 GT is a SOLID 12 second car, with traction it would be an 11 second car, and I am still on stock L67 injectors, and a weaker fuel pump than the supercharged guys.

While pretty close, this is not technically correct. The PCM does lock in the current LTFT when at WOT however it has other tables such as RPM vs. Time and the Power Enrichment table that add fuel to avoid being lean and supply the fuel needed as the motor heats up and revs faster.