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I have an 05 canyon. It was running rough and losing power at stop lights. I got the throttle body cleaned and it runs great now. Try that its an inexpensive fix. It needs to be done about every 25,000 miles.
it means that your fuel is running too rich,and needs more oxygen for a cleaner burn. i think that your oxygen sesor may be faulty,but have autozone run the trouble codes for you,and see what exact part is bad.
Replace the blower motor resister,it is mounted right next to the blower motor,it has a lug with about 7 wires on it.Just unplug it and remove two screws to remove the resister.This controls the speeds for the blower motor.The blower motor is the cause of the resister failure.Even if the motor seems to sound,and run fine,it is pulling to many amps.
It seems that it is misfiring due to a bad sparkplug, plug wire, or dirty aircleaner. the problem only gets worse when the load of the AC/heater motor is on. Have a tune up done to your GMC.
There is a fuse I would check first if you haven't tried that yet. They had problems with the switches in some of those vehicles. If you could take the control out and unpug then reattach the plug it may start working meaning the switch is bad.
You may have a bad fan motor. Do you have a test light to check for voltage at the motor itself?
Lastly, there is a resistor set that changes from low to high that may have one or more resistors burned out.
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