We have a 2004 GMC Yukon. Since we've had it, reduced engine power has become a constant and dangerous problem. Most recently, yesterday, my husband was trying to accelerate to pass a slower vehicle with huge tires on the back only to have this happen. If someone had been behind us, we would have been hit, seriously injured, maybe even dead with some of the circumstances we have had on the interstate. Today is August 23, 2011. We had this vehicle fixed on July 28, 2011, paying almost $600 for it to be taken care of. It says on the ticket that we told them about it and were under the impression this would take care of it. They replaced the accelerator pedal assembly, which I believe included the app sensor, and cleaned the throttle body of excessive carbon build up. After spending $500-600, I want to know why we are still having this problem along with so many others I have seen complain about it online? GMC has a known problem that needs to be resolved.

- Calera, AL, USA

One side of engine block is burning out all 4 spark plugs; need diagnostic information sent to our mechanic so he can fix this problem. No response. Engine light is on. Total mileage on 2004 Yukon ll purchased from dave smith auto, kellog Idaho in Nov of 2004 is 1,292. Yes, this is correct. One thousand two hundred and ninety two miles! I would think GMC or dave smith would be interested in fixing this problem especially with a new vehicle. Waiting for them to reply to warranty work. We are a remote site women's shelter. We need a vehicle that runs!

- Nome, AK, USA