Reduced engine power light on a 2003 GMC 2500 HD. While driving down the road without notice, the engine would lose most of its power and run rough with a low RPM. The throttle is not responsive at all and the engine light says reduced engine power. This is what I did to fix the problem, I have now drove over 15 thousand miles since with no issues. It is a pretty simple fix.
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Dorman 977-000 Throttle Body Position Sensor
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