Idi help

[Ballsdeepoffroad]

Got a 89 7.3 idi non turbo cranks right up and idles fine most of the time you drive it maybe a 1/8 mile and it sputters and cuts off but cranks back no fuel leaks new return lines and caps new injector lines 7psi at filter I changed the glow plugs and this is when it all started ran like a top before that also the truck will not crank with the key the previous owner installed a push button starter and push button glow plugs installed ignition switch on steering colueme still won't turn over put it in neutral to see if it was the neutral safety switch but still nothing any help would be great it's my only truck so I need it running