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IAC valve issues

Old 3/17/19, 10:25 PM
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IAC valve issues

I recently purchased an 1996 GT/ 5 speed with 54,000 miles on it. Drove it for about a week with 0 issues. Now all of the sudden the car idles high (around 1800-2000 RPM). Car will crank, but has issues starting. When it does start and I do get going sometimes the car will violently jump in 1st gear around 2500-3000 rpm. I've cleaned the throttle body, did nothing. I checked for vacuum leaks, and didn't find anything obvious. ( first mustang so I could be missing something.) I read a few different things about the IAC valve. I think that could be my issue with the high idle, but it doesn't explain my car jumping. I have the IAC with the black vent on top, and when the car is idling and, I unplug it, the idle drops to a normal level. I need some help from the Mustang gurus of the forum.
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Old 3/17/19, 11:13 PM
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I'm kind of thinking maybe the throttle position sensor. Only because I had a Lincoln Mark VII once, with EEC-IV mind you, that would all of a sudden while cruising would speed up and even backing off throttle the speed would remain. The TPS was defective. Also have you tried cleaning the MAF sensor as well?
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Old 3/18/19, 12:00 AM
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Cleaning the MAF is my next step. I didn't have time to pick up MAF cleaner today. Hopefully that helps .
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Old 3/22/19, 10:12 PM
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Found the problem. It was the coolant temperature sensor and switch. Replaced both and it runs like a champ.
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