Run engine til it's warm. Shut it off and jumper pins A and B. Turn key on, do not start. Wait 10 seconds, and then unplug the IAC. Confirm It has closed all the way. You should be able to see the tip if it through the top of the throttle body. Turn key off. Remove jumper across A and B. Start engine and turn manual idle adjustment screw counter clockwise until the idle comes down. Check to make sure that the throttle shaft is actually resting on the manual idle adjustment screw and it isn't bound up in the body of the TBI. Now you should be idling in spec. Shut off and reconnect IAC. Restart engine and see what it does.
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