i have a 2004 6.0 powerstroke build date 07/03 when im driving while on the throttle the glow plug light comes on then it wants to shut off rpms jump up and down sometimes it will shut off or if im coasting at idle and hit the breaks to stop and start turning the wheel it shuts off like you shut the key off my sct x4 says no communication to key this all happened out of no where went on a 100 mile trip got back home shut it off went out to leave started right up driving and about a mile it started when i let off the throttle been having a problem ever since

 

If it's the gas motor I had this same problem. I went threw 4 fuel pumps trying to figure it out. I replaced crankshaft sensors and cam shaft sensors. Still don't work finally I was trying to find out where my fuel pump relay is and turns out my truck has a factory delete fuse box. So I only have one that's located in the cab. If you take the fuse box apart there's 5 relays built on the motherboard. you have to solder them off. some guy sells them on eBay for like 5-10 bucks. That was my problem. Ford wants you to buy a whole new fuse box which is 500 bucks. This fixes the problem and is alot cheaper.

 

I believe Ford has a recall about this problem. Go to Fordparts.com and type your vin in. I might be wrong but when I was researching ,y problems I remember reading something about this.