Could be Idle control valve sticking, vacuam hose leaking or upper intake plenum gasket failure, if you've already checked to make sure thottle plates are closing. Next time it happens, try tapping on the IAC with a small hammer and see if the idle drops to normal.
I was advised to replace the ICM with a NEW one, not secondhand. My ICM checks out OK. Why would a...
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I was advised to replace the ICM with a NEW one, not secondhand. My ICM checks out OK. Why would a NEW one make a difference?
Running lights on my 1991 Ford cab Fleetwood Tioga motorhome. How do I look for a free diagram on...
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Running lights on my 1991 Ford cab Fleetwood Tioga motorhome. How do I look for a free diagram on wiring?