A couple weeks ago my 89 F 250 just lost all power leaving me stranded. Turned the key and nothing, no dash power, no radio, no fuel pump. A couple days later it fired right up. Then a few days after that it did it again. Driving down the road and no power all of a sudden. Truck dies, nothing. Next day turned the key everything fires right up. Yesterday the truck fires up, drive it for about twenty minutes, and it dies again. Can't figure what the problem would be. Anybody have any ideas?