2003 GMC Sierra

2003 GMC SIERRA
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ASOLIS
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Engine Performance problem
2003 GMC Sierra V8 Two Wheel Drive Automatic

reduced engine performance came on in the message center, running fine before, barely moving afterwards
Aug 31, 2010 at 5:09 PM
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WRENCHTECH
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That usually means a problem with the "Drive by Wire" throttle system. It has dual sensors in it and when one malfunctions, it goes to half throttle maximum. Your going to need a professional scan tool, preferably a GM tool to be able to diagnose it properly.
Aug 31, 2010 at 5:28 PM