Going down the road cruising at 65 mph, all of the sudden the rpms go down to about 550 (according to Scangauge). Truck runs rough, sputters can't drive more than 2 mph. If I press the gas pedal hard, it will die. It acts like it is running out of gas, but its got a full tank. Any help on this one is appreciated. Also, truck is now officially for sale.