Got an LS6 that misfires on all cylinders at idle, as soon as you touch the gas the misfires stop.
I am monitoring the misfire with the scan tool, the idle misfires are enough to light the CEL (P0300). This motor has new coils, and wires. I have just added headers and a new exhaust system, the motor does need to be tuned but I am not sure why I only see misfires at idle.
Could bad idle tuning cause these misfires? Idling around 800 rpm.
- 2002 LS6, about 2000 miles on fresh motor.
- 226, 229, 585, 575 116 LSA Cam
- 85mm MAF