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Old 11-17-2020, 10:30 PM   #4
Hidesertchevy
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Join Date: Mar 2017
Location: yucca valley
Posts: 239
Re: 2003 GMC 2500 HD 8.1L need help with cruise control wires

I had the same problem ended up being broken wire inside insulation at the intake throttle body harness plug. Same reduced engine power. Just bought a replacement harness plug from chevy and wired it in.
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