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
have the same problem?
Tuesday, August 31st, 2010 AT 5:09 PM
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.