You got two belts on this vehicle the serpentine belt which runs the power steering, water pump, alternator. Behind the serpentine belt toward the bottom if the engine compartment theres a smaller belt that runs frm the crank to the ac compressor and the belt tensioner.
SOURCE: u-joint repalcement for 2001 yukon xl
Mark your drive shaft coincidenly with the rear axle and tranny. Remove drive shaft. Press out the old u joints and press in the new. You will need a torch for heat and a lot of patience. Have fun!
SOURCE: how to change the serpentine belt on a 2001 GMC
Where is the serpentine belt tensioner on a '03 gmc yukon?
SOURCE: problems with acceleration - 2001 Yukon
Most likely it is due t5o dirty fuel injectors or bad mass air flow sensor
SOURCE: PO300 Multiple Cylinder Misfire Detected on GMC 5.3L Yukon
If spark plugs and wires are done and it doesn't have a dead miss under load, usually it is the crank sensor acting up. It is a colon tab in all repair manuals
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