Re: '87 IROC TPI idle stall w/air on
Sounds like you should take the IAC out and clean it. It could have a build-up of carbon on the pintle and the passage. You could clean with carb spray.
Also the throttle blades could be dirty around the edges and the back side of the shaft. It doesn't take much.
So basically, clean the throttle body and remove what they call "coking".
As far as an "idle learn" that usually applies to a motor with an Idle Speed Control motor. (ISC)
It is done with the motor at operating temp, go into diagnostics, and run at idle for a couple of minutes in gear, then turn AC on and run for a couple more, and then put back into park and turn off key.
And it isn't setting a code when the check engine light comes on, it could just be that under 400 RPM or so, the ECM sees no distributor signal. (Code 12)
Don ~ TC Member #15 ~
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