When I start my truck with my foot on the brake pedal the RPM'S red line like my foot is on the gas pedal. As soon as I release the brake pedal the RPM'S go back down to normal cold idle. I have checked to make sure my foot was not on the gas pedal! I also have weather tech floor mats so I know that the floor mat is not on the gas pedal. There's no check engine light so I know the dealership will say there is nothing that they are able to do without seeing what it's doing. I have thought about just letting the truck blow up. Hope this helps to fix the situation!