ok, heres what happened, i was just getting on the freeway and at about 60mph i loose all power, i pull ot the side and rpm's drop to 150-200. then the truck dies. i try to start it after and it fires right up and seems normal, so i procede to drive home instead of work. about 3 min down the road, at a red light, rpm's drop and truck starrts to shake and the engine dies. i try to start it and it wont fire up, its cranking, sputters around 200rpm, and then shuts off. i also see white smoke coming out the rear. could this be a bad fuel pump? clogged line? or just the fuel filter? any other possibilities.