I have a 96 F250 with 7.3 powerstroke that will just up and die like you turned the key off. After cycling the key it will restart and run but will intermittently cutout four or five times and then run fine. Seems to do this when I hit the brakes. If I have my trailer brake regulator hooked up it will do it immediately if I hit the brakes every time. I have checked all of my grounds and harnesses and can find nothing wrong. Would a week camshaft position sensor be causing this? Thanks for any help guys.