My 02 7.3 died the other day after I hooked up my trailer and pulled around to the front of my house. It started just fine and ran for 20 minutes or so and then died and wouldn't start. I left it for about 6 hours and it started right up like nothing was wrong. I had this happen a couple years ago too. I changed the cam positioning censor then and it ran fine ever since. So I thought it was the cam positioning censor again. I changed it yesterday and the truck died again today ? What should I check next ?