I had the same problem for months, after the car died on hubby when he got in traffic getting on a busy interstate his brother brought a snap on computer to the house and hooked it up.The IAC was hanging up , got a new one from Advance $68 w tax they put it on yesterday, I tested it today and It fixed it and I have more power again . I can't wait to see what it does for my fuel mileage!!
100% sure IAC!!!

95 Teal Se 5 spd,duratech, loaded(except moonroof) no mods.