Diesel Bombers - My Truck wont stay Running

I have a 2004 Ford F250 Powerstroke 6.0L and I have had a lot of issues over the last few months and I have thrown alot of parts at it. I drove to work back in April and when I went to leave my truck wouldnt start. After alot of research and having a local Ford Mechanic come run the codes and I needed to replace my FICM so I did and the truck started right up. I drove home with no issues but the EGR cooler was bad and I was having issues with it locking up so I took it apart and installed an EGR cooler that was blocked off. After putting the truck back together we drove it for about 15 minutes and it shut down on us when we started to stop. Went back about 4 hours later and added fuel and she started right up drove about 15 minutes and she shut down again. Since then I have changed the IPR valve twice and it would start now and then but never run more than about 15 minutes. The mechanic from ford came by and we blocked off each side of the injectors and got 800psi on one side and 1000psi on the other. We got the truck started ran it for a few minutes shut it off and then it wouldnt start again so I changed out both check valves on each side and put the truck back together and nothing. My Son read on here that we needed to try changing the oil so we did and the truck finaly started and ran for 34 minutes before she shut down. She wouldnt start again and then about 4 hours later started right up three times in a row which was very rare. I test drove it and that lasted about 8 minutes then she shut down. Last night after she shut down I went out about 5 hours later she started right up and I parked her in the driveway and I am planning on tearing the top-end down this weekend to check the High Pressure pump. So does anyone else have any ideas? I have changed the FICM, IPR Valve, Cam positioning sensor the oil and had the FICM, Transmission control module and the CPU all reprogramed. Any assistance is welcome. Thanks:argh: