Question about 2000 GMC Sierra

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2000 gmc sierra 1500 4.8____ trans problem

When on freeway doing 65mph the transmission will loose power and the rpm will rise because my foot is on the gas. i notice when it goes down to 50 mph it is running a bit ok but if i put the automatic in 3rd its fine u can feel the pull. does any one knows this problem? also i had the tranny rebuilt 3 yrs ago

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  • Paul McGrath
    Paul McGrath May 11, 2010

    sounds like a problem with the throttle position sensor -- if this sensor is sending 'inaccurate' information/signal to the PCM/TCM, then it doesn't know what to think/do. check it with an analog meter (to see if the resistance readings are 'steady' from 'idle' position to WOT....

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Od is going back out

Posted on May 26, 2009

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