Diesel Bombers - Help. 1994 12 valve dying for unknown reason.

I got a 1994 12 valve about a month ago and I have a big issue that I cannot figure out. I can crank it over, sometimes it takes a bit, it will try, then finally start. It will run for a minute or two then it will die on it's own. I tried a second time, pushed down on the petal when it did the same thing a second time and the RPMs still dropped and it still died. This is all at an idle in park. It will randomly try to die while driving down the road sometimes and I'll be able to start it back up. After a couple miles it does the same thing. I've replaced the fuel shut off solenoid, along with the fuel filter, and bled the fuel system. There's also no leaks in any of my fuel lines that I've seen so far. I've searched everywhere on the internet to see what I can find, yet I'm still not sure. Does anyone know what's going on? I want to drive it but I can't because at anytime it might randomly die on me. Im stumped at this point trying to figure it out and I'm looking for answers.