Booost Almighty

I have a 98 24v cummins with the edge comp. fuel box on it. Every since I installed it, it has been running great except for when its under a load. When I have it loaded down it skips a lil' on hills and such. It kinda feels like its running outta gas or hitting a lean spot.
Anybody else have these problems???

kawi600

you running a fuel pressure gauge? Thats the first thing Id do is verify the pressure. Then maybe look into lift pump and overflow valve, etc.