Truck dies then restarts.....sometimes

[deezer5150]

A friend of mine has a 1995 PSD with about 250,000 miles on it. Lately it has been stalling with no warning. It does not always restart right away. I know, I know, you are going to say it is the CPS but it has been replaced multiple times. The glow plug relay has been replaced. The only thing I can think of is maybe the injector harness is having a problem and cutting off the fuel. I am at a loss and so is he. Any ideas you guys may have would be greatly appreciated. I'm going to post this in a couple of spots here so I get some coverage.

Regards

[JSchuricht]

The GPR won't cause a truck to stall. The CPS is common, but you already tried that. When it stalls is is smoking, sputtering like its out of fuel or just acting like the key was turned off?

[deezer5150]

doesn't smoke, doesn't sputter, just quits like it was shut off.

[Ronald]

Did you find out whats going on? Im having the same problem. Please Reply. thank you