Check the fuel presure, then i would pop the top on the AFC and give the starwheel a few cranks and even slide the stock plate forward.
When i first got my truck thats how it ran, decent till about 2g then fell flat on its azz. First off i had slid the stock plate forward, that helped it from laying down above 2g but it still seemed to be lacking alot of power so i spun the starwheel forward and omg what a difference, all kinds of power down low!
Then it all goes to hell after that, ya gotta pull the plate and grind that to a '0' and block off the wastegate, turbo, injectors, intake, exhaust...
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97 Ram 2500 / 5.9ctd / 5spd / nv4500 / 4x4 / np241
Starwheel cranked, no plate, autometer pyro and boost gauges, Single 4" stack, 33x10.5 Mud terrains, tons more to come