very high idle

had something strange happen this evening.
went to turn car on, it jumped real high in the idle, up to 2000 RPm. I shut it off right away, than restarted it and it idled fine.
Let car sit for a while, and it did it again.
I cleaned the IAC, and the hole that it goes in. Restarted it a few times afterwards, and it idled fine.
Is the IAC going bad? Could it be the Throttle Position Sensor?

Any thoughts??

Thanks!!!
Paul

There's another post about the exact same thing. It could be an IAC, I guess.