91 Cherokee sport 4.0. I have a high flow system (cold air, 4 port injectors, cat back exhaust, 62mm Tbody) and it has ran great for a while but recently every time I hit the gas a little hard, like starting from a stop light or even just pulling out of my driveway, it will shudder and shut off. Would this be a fuel pump problem or fuel line problem?

 

I would start by pressure testing at the rail and see what psi you get.