tough to start and once start dies in seconds put new thottle body on, same thing on 1993 GMC Vandura 2500

my van is tough to start once started dies in seconds
tried to drive it home no power, change thottle body and
check for vacuum leak change dfpe sensor and thottle p sensor same problem

Asked by for the 1993 GMC Vandura 2500
Do you have good fuel pressure? It's easy to replace the fuel filter, it could be plugged if it's not relatively new or you got some contaminated fuel which could have plugged it up.