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 runs great everywhere but idle.
Ive tried locking timing and fueling. Used Russ K's idle airflow config.
All adaptives should be turned off
The only thing ive noticed is that if I lock the IAC position it hardly surges at all.
I attached a log of the surge it gets worse towards the end and at the end I locked the IAC.
idle surge 2.hpl
2004 gto Idle tune file_0001(closed loop disabled)_002.hpt