It sounds like a fuel delivery problem, maybe the fuel pump. Since it starts after a few days it sounds like the pump works well enough to get the fuel to the engine, but once the pump needs to continue to deliver fuel on an ongoing basis, it dies out. I'm not positive, but it could be the problem. You might also have dirty fuel injectors, or a vaccum leak of some sort around the throttle body. It's easy to know if you are having vaccum problems becasue you will hear a hissing noise.
My bet is the fuel pump, but again I'm not 100%. The fuel pump is located inside the gas tank. You would need to lower the gas tank to get to it, and pumps are typically about $150-200. I hope this helps...
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try replacing the fuel pump reley
they are a little bit funny in fords
i had a ford 1 time thet ran fine for hours in the driveway but go 2 blocks and the truck would die dam reley took me 2 monthes to diagnose once i did i had a great vechiale untill a dui hit me broad side
If that is carbureted, and has a mechanical fuel pump, try running a length of fuel line from inlet side of pump to a gas can that has fresh, clean fuel, and if it runs good that way, you know problem is most likely in the tank. Removing the tank & cleaning it out is best solution from there. I'd even be tempted to add a small bottle or 2 of Lucas Fuel Sytem Cleaner to first fill in clean tank, just to help clean lines as well as carb.