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82 Ford F150 w/ 351W.....will run and idle fine for a short time and cut off suddenly. It will happen when I'm driving....or sitting in driveway. Happens at different intervals as well. I have replaced coil, distributor, rotor, cap, plug wires.I can usually get it restarted ..could it be fuel related?
Do you have spark immediately after quitting? I had a magnetic pickup go out in my dizzy and it would lose the spark and then come back normal all of a sudden...I kept losing spark for longer intervals until it sat for several hours...then I finally tracked down the faulty pickup...if you get spark, then I would say a problem in the fuel pump or even water in the gas (pretty rare, though). do you have dual tanks? Could be a problem there also, but I would look electrical first, then for intermittent problems with the fuel pump!!