03 2500HD lq4 block,408 stroker, ls3 heads , gm stage2 cam ,102 throttle body ,42lb injectors now. I had speed inc do first tune set up and ran some what , had 96lb injectors which to big for no turbo/blower ,so got 50lb injectors . took truck to another place had them redo tune said could not set up 50lb injectors at 50 only to 39lb ,when I took truck home ran ok ,next morning would not start just start and die left it , swapped out fuel pump to a stealth 340 ,pressure at 50psi now with the 42lb injectors in , can this be a tune issue ?