Truck shuts down while driving

We need to do two things. First check for codes.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Next we need to check fuel pressure. I suspect we are loosing pressure somewhere because on this engine we just need air and fuel due to no plugs.

This is normally caused by a faulty lift pump that is not sending enough fuel to the high pressure pump causing a stall. Then when you cycle the key the pump is able to catch up.

I attached the process on how to test the pressure on this engine. Just make sure you are using the appropriate gauge as this is high pressure. Also, make sure you don't leave a line open when you crank the engine or high pressure fuel could injury you or damage the vehicle.

Could the pump in the valley do this too? Because the guy that owned it before I did didn't take care of anything. I've already replaced the majority of stuff. ICP, IDM, back pressure exhaust sensor and tube coolant condenser.. Just slowly going through it all. I really appreciate your help. This site is a life saver.

By the pump in the valley I assume you mean the ICP system? I attached the info.

In short yes. I suspect we have a fuel related issue so really anything even down to a restricted fuel filter. So we need to start going through the whole system. I would start with the pressure but I am pretty sure this is a fuel issue either supply or control.