2005 Subaru WRX High RPMs while car is stopped

2005 SUBARU WRX
121,000 MILES • 4 CYL • AWD • MANUAL
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MSTARR17
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Keep in mind this problem only occurs when the weather is warm and I am driving in stop and go traffic......When stopped (after being in stop and go traffic for at least a few minutes) RPMs read 2000-3500 and engine sounds as if the accelerator is being pushed. This occurs no matter what gear car is in, even nuetral, with clutch in or out. It has happened off and on for awhile now. Last week, while stuck in traffic the RPMs went over 4000 and the car began to overheat.
Aug 26, 2010 at 7:56 PM
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RASMATAZ
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Do you have a check engine light?

Check and test the idle air control solenoid and throttle position sensor
Aug 27, 2010 at 4:48 AM