While Jordo!'s bad sensor diagnosis has a good chance of being correct, I'd try powering down the ECM first. It's easy to do - remove battery cable and step on brake pedal for a few seconds, then reconnect battery. The car may run rough for a bit while the ECM relearns the engine and you'll have to reset the windows (procedure has been given many times; use search). You may also lose the radio presets.
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