That is what has been diagnosed by Bridgeway Cummins. They have repalced everything else on the truck except that part.
The truck hits 2600 rpm and defuels. New map sensor, new engine wire harness. All mods have been removed from truck before going into shop.
ECM has been reclabrated by Cummins.
The defueling is not a goverened defueling, but a cutout of the injector pump, like the processor on the pump is cycling on and off.