I have a 2004 Ford diesel that is not running right. My truck will lose power first then spit and sputter then eventually quite. First thing I did was change the fuel/water seperator and it ran for a day. Then I flushed the tank and lines and it ran for a day. Then the auxiliary pump (not the one in the tank) was changed and it ran another day. Last we changed the fuel pressure regulator and I have driven it for a week. Now it calved again!
Does anyone have an answer injector problem? Mass Air Flow sensor? EGR valve? HELP!

Replace the fuel pump.