it's a 78 f150 with a 351m. i'll be driving and suddenly the engine goes quiet, no sound at all, no response. almost as if it has shut off, sometimes i can pump the gas and it will come back on, sometimes i can shift to nuetral and turn the key and it just picks back up. though it doesn't sound like it turns over or starts back up. i'm thinking it's either fuel or electrical related, i changed the fuel filter, but it still happens so maybe it's the pump. any ideas, questions??