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You were right! leaning it out made it idle nice and steady. Only problem now is when I enable closed loop it adds fuel back in and creates another surge not nearly as bad though.

Heres a log with stit and ltit logged. I thought all my adaptives were turned off but I guess I wrong. Have way through this log I commanded a set IAC value and locked timing. It seemed to idle...

Log of the idle is in my first post just in front of my tune, it almost looks like there the same file.
MAF is zeroed out because im running in speed density only.
Base airlfow is zero in P/N...

So changing the min fuel grams had no effect on idle quality. Any other ideas out there?

I'll give that a try thanks. Also injectors are 36lb GTP's.

Hey guys been driving myself crazy trying to get rid of the idle surge on this setup. Its a 2004 ls1 with PRC 225 heads and 228/230 duration .588 Lift cam, 36lb GTP injectors with a t56 behind it. It...

I was leaning towards the ECM being the culprit but I may have messed something up in the wiring harness.
At both the O2 sensor connectors with key off I have a ground on the ground pin that has...

By luck I might have found the problem. I had the passenger O2 unplugged and with the motor running and just happened to be logging. I revved the motor a bit and noticed that the ltft's spiked...

Thought id revive this as i still haven't figured out whats going on. I rebuilt the motor and added PRC heads and changed the injectors but im still having the same problem. Both 02's are new now....

So this issue has evolved. Intake gaskets did not fix the problem. I started the car and it was popping like crazy out the exhaust. I did a compression test and all cylinders were between 180 and 210...

I did last night! Problem is from a vacuum leak on cylinder 4. Not sure why new gaskets are leaking but whatever, I got the problem figured out!

Thanks for everyones Input!

They probably would but there's no room for me to get my hands up there to swap them. I pretty much eliminated the side to side issue though. I check the each wire at the O2's was going to the...

Bank 1 decreases slowly.

Did check plugs and to no surprise bank 2 is extremely rich. bank 1 is running pretty good. Also broke out my stethoscope and could hear all the injectors firing.

All...

Logged the pulse width and the banks are not equal. Bank 2 pulse width rises as the O2 gets leaner which makes sense to me. Haven't got a chance to make sure all wires are going to there correct...

I don't see any option for pulse width on different banks.

I swapped injectors and still the symptoms are the same. Ill start checking that all wire for injectors and coils are going to the...

Swapped sensors side to side and no change. Seems like either a spark or fuel issue on the passenger side.

IAT is wired in and was plugged in during the last log not sure why it wasn't working. For whatever reason the IAT sensor started working when I unplugged the passenger and stayed working when i...

Hey guys, first post here. Ive got an 85 trans am with an ls1 and t56 from an 04 GTO thats stock besides a 228/230 cam and longtube headers. I just got started tuning it. My only experience tuning is...