I had been having some troubles with the idle speed going high after it warmed, up, around 1200-1300 rpm, but not always.

It would start normally, run at regular idle and then sometimes runup in idle. If I shut the car down and restarted it, it cleared sometimes. It usually took many cranks to get it going.

Last week after driving for approx 10 miles I stopped in somewhere, came back out in a few minutes, it started right up then stopped and I couldnt start it for approx 30 minutes.

I looked at some of the posts and thought it'd be good to clean the throttle body first.

The throttle body was loaded with all kinds of black residue, problem the result of 240K+ miles; a mechanic friend of my did not see this as unusual.

After cleaning, the car runs in idle position at around 1500 rpm cold then migrate to around 1800-2000 rpm as it warmed up. Restarts have not seemed to be problem as before. If I pull the IAC hose and plug the port at either end there is really no change, but the IAC is full open. I checked the TPS and it clicks and changes to another mode when this occurs. The IAC hoses look fine. Several months ago I pulled out the IAC and cleaned it to free it up. I remember putting a stethocope on it then and could here it buzzing, which if I remember right was the proper operation.

The idle air speed adjustment is all the way in, any adjustment the other way raises the idle.

IF I remove the connector from the AMM, rpm drops a bit and it goes into the default pedulum mode of higher then lower rpm.

It acts like some connection has gone awry.