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rpms drop when driving

   
Old Dec 29, 2014 | 9:15 PM
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brbynum60
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Exclamation rpms drop when driving
My 2004 Chevy avalanche started droping rpms when I drive seems like it drops when it ships into a higher gear then goes back up please help
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Old Dec 31, 2014 | 4:33 PM
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Heuer631
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I think you either need an Idle Air Control, or your TCM (Transmission Control Module) needs a reprogram. Either a reprogram or a whole new TCM.
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