3.1 V6 idle issues

Could someone point me to the FAQ (if there is one) for this ng ? Or , if someone has experience with a too-fast (like 45 mph sometimes !) idle on a 3.1 V6 , I'd be interested in your cure, if you found one . The
motor has done this occasionally since around 70k miles . Now has 220k on the car (96 Corsica ), 50k+ since complete rebuild due to overheat/dropped intake seals . It's getting a bit worse now , and sometimes will drop to a normal idle (and sometimes won't) if I turn the key off and then back on quickly . I can't find any vacuum leaks , fuel leaks , and the car runs great otherwise , mileage around 30 MPG avg . It does not seem to be tied to the A/C idle step-up .
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Snag aka OSG #1
'76 FLH "Bag Lady"
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Have it scanned and look atr the iac count, if ok, try cleaning the throttle body and remove the iac and clean the pintle and seat in the throttle body.

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