My 94 pickup instantly died while running perfectly. Think it fuel related as it still turns over. dysplayed no issues until it instantly cut oit

 

Can you hear the fuel pump running? Quick, easy check is to turn the key to start, but don't press the clutch pedal down, or utilize the Clutch Cancel switch. You SHOULD be able to hear the fuel pump running.
If you pull the return line off the FPR, and put a hose going to a container of some sort, do you get fuel out when the Fp->B+ jumper is in, and the key is in the Run position? You can also pull the cold start injector off the throttle body, and see if you get fuel out with the jumper in. Don't take the fuel line or the plug off it. Just place it in a container to catch the fuel, and check for spray.

Also, you might want to check the timing, and the plugs. You can check the plugs by hooking the inductive pickup on your timing light onto each plug wire. If it flashes, it's OK. No flash, distributor, or rotor, or plug wires.

All these contribute to making the truck run, after all. Fuel, ignition, air, compression. Check each one to see what's missing.
Good luck!
Pat☺