I am stumped. I have a 1996 B2500 5.9 MPFI.
I have replaced the IAC valve, the MAP, and the intake air temp sensor
but I still have an idle problem. Oh yea, I checked the TPS voltages
and they were correct.
When it's cold it idles ok, and "sometimes" when it is warm it will
slowly raise the idle RPM and slowly fade back to normal. I can not
really call it a rumble, surge, or loping. I can call it irritating.
No codes, no vacuum leaks, no egr, and I cleaned the throttle body.
I am not sure what the water temp sensor does, but this is my next
Does anyone have any wizdom, other than take it to a dealer. I
personally would like to learn what is going on here. Of course I
could pay but what good would that do for me to learn?