Cavalier engine revving constantly

I have had my car in storage for three months and now when I started it the engine revs between 3k and 4 k constantly. It has a 2.4 DOHC engine. The battery was dead and I had to jump the car to start it. Any ideas???

Sticking IAC valve???

It needs to relearn its idle settings. When the battery dies or is disconnected the ECM gets reset. Give it a little time and it should return to normal on its own.

If it's idleing that high, I would say it's a stuck IAC, that's awfully high rpm for ECM amnesia