[bowtiebandit]

Well normally you would need a scan tool to do what is called an idle learn procedure but try this. Start the car, with parking brake applied put it in gear foot on brake and wait for the coolant fan to come on. Then take it on a long highway trip, 20 miles or so and that should do it. If not you'll have to try a dealer I'm afraid.
Basically what has happened is the ECM has lost its memory of how the cars settings where and is trying to relearn, TPS, IAC, throttle angle, idle speed and so on.