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  1. Chevy Silverado Forum (GMC Sierra)
    I have a 2003 5.3l sierra 1500, i have changed the TPS and the master flow sensor... But one day for no reason, reduced engine power come up when defrost is on but when i turn the defrost off the reduced power mode disapear... I don't know what to do with that thanks for your help
    gmc sierra 1500 2003 reduced engine power tps
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