Wants to accelerate

2003 CHEVROLET IMPALA
240,000 MILES
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3333333333J
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Accelerates by itself. Not all the time, but a lot of it. Replaced the throttle position sensor, but didn't help. Any more ideas?
Apr 11, 2013 at 4:00 PM
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ASEMASTER6371
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could be a vacuum leak, throttle body not closing all the way are among many of the possibilities

Roy
Apr 11, 2013 at 4:30 PM