Some possibilities. Inspect.
High resistance in an iac valve control circuit.
The correct pcv valve, properly installed and proper operation of pcv valve.
Proper operation and installation of all air intake components. Check the maf sensor, where applicable.
A tampered throttle stop screw, where applicable.
Damaged throttle plate--throttle shaft--throttle linkage--cruise control.
Skewed high TP sensor/ circuit issue.
Excessive deposits in the iac passage or iac pintle.
Excessive deposts in throttle bore or on throttle plate.
A condition that the iac valve can not overcome.
I know you had no codes, but, there is a high idle speed code listed for your vehicle, even though the code didnt set. The above possibilities were listed for that code. I realize you have already checked some of those issues.
If you have a scanner that will show live engine data or have a friend that has a scanner that will show live engine data, now would be a good time to use it.
Wednesday, February 27th, 2013 AT 4:41 PM