It does it now when it gets warm and will start back up for a bit then will not start and has to sit for a few hours to cool off. I feel I should remember what causes this since I've worked on these before, but have completely forgotten. Any help is appreciated.

 

Crank/cam position sensor?

 

There we go!! That's what I was thinking but couldn't for the life of me think of it!

 

Don't forget that only an actual International/Navistar or Ford Motorcraft one should be fitted, the aftermarket ones are made of fail.

 

Wouldn't ever dream of aftermarket for those sensors. Will definitely be from ford.