Put 191 DV in my truck yesterday. Got it running and went for a ride, it was popping/sputtering when it went to wot. Went back and made sure all springs were seated on the dv and torqued back down blead the lines and injectors. Truck runs fine unitl wot cant really tell any power gains. I dont have a fuel pressure guage and stock fuel system. It runs better 3/4 throttle than wot is it time for a pusher pump???? Any Ideas on whats causing this.

 

Not much help here....I put in LC DV and didn't have a problem with my almost stock fuel system.At highway speed does it seem to cut in and out?The only difference I have is 215 injectors...