Accelerator Pedal problems of the 2016 GMC Yukon

The contact owns a 2016 GMC Yukon xl. The contact stated that while stopped at a red light and depressing the accelerator pedal, the vehicle jerked and jumped forward. There was a loud sound coming from the engine. The accelerator pedal was depressed but the vehicle failed to accelerate above 5 mph. The check engine warning light was illuminated. The contact veered to the side of the road. After several attempts, the vehicle restarted. The vehicle was taken to the local dealer, where it was diagnosed that there was a misfire on the lifter in cylinder #1 and #7. The vehicle was not repaired. The dealer informed the contact that the warranty coverage was declined. The manufacturer was contacted and declined a buyback. No assistance was provided. The failure mileage was approximately 96,891.