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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
 

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the HVAC defrost mode reduced the engine power ?
did the HVAC turn on the ac compressor ? look up the drive belts/take off the compressor belt spin the compressor and check the belt tension-er ..
 
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