Three things immediately come to mind..... sticking IAC, binding throttle
cable or linkage or there is the remote possibility that the PCM isn't
receiving clutch pedal position sense.
Here's how it works.... as we are driving, the PCM moves the IAC to a very
wide opening. This way, if we suddenly close the throttle, the motor doesn't
stall or momentarily run rough due to "dashpot" effect as the PCM slowly
closes the IAC.
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