Rough idle - Hard starts - Cold starts

[Marv D]

Originally Posted by Special-Ed

Iac valve. It's a stepper motor with pintle and seat. Take it off and clean the surface

Also with motor off make sure the trottlebody and butterfly are clean.
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DITTO, The IAC is a problem with the early TBI. Carbon builds up on it and it doesn't want to come to 'rest'. If you start having high idle issues, the IAC is always suspect.

Also my old tried and true standby. Change the fuel filter!! If ANYTHING even starts to be a hit of a problem on the TBI motors I change the fuel filter (even if it's only been a few months since changing)