2001 4.3 Vortec Why are IAC counts increasing after shutoff of eng
I have a 2001 S10 Blazer with the 4.3 Vortec and a 0411 computer. I have the MAF disabled to run in speed density mode. After the engine is warmed up. If you shut it off and let it set for a feww minuted. When you turn the key back on before you started it the IAC counts will be at 84 which is up from 50 that it normal runs at when warm. When it is then started, the LTFT will be at +18. It will struggle to idle for a few minutes until the IAC counts come back to 50 and the LTFT will be near 0. If you shut it off and start it right up is does not do this. It is only after it is warm and it sets for a few minutes. Also does anyone know if the missfire monitoring is disabled when the MAF is disabled to run in speed density mode.
Ken