Hi,
Just installed my new TB spacer on my 4.0L.
Pulled the IAC unit off the side of the throttle body as you advised GOjeep and cleaned the piston and seat with de-greaser. Sure enough it was built up with carbon deposit at the seat.
Took for a test run, rev fault now gone when started hot. Now it just starts up at 800rpm with out the over rev.
Thanks for the advice,
Dave.
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