Re: IAC question...
My 90 had a slight gap. Don't know if they are 100% closed when de-energized, but to make sure mine was in fully closed position, I started the car, pulled off one of vac hoses on the plenum (causing idle to increase and IAC to compensate), and disconnected the harness from the IAC, hopefully "locking it" in closed position. Then stopped the car and did the gap test.
Worn throttle blades seem to be the most popular cause of high idle these days.
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