This is a 2013 GM 3500 with a LML duramax. The engine is a new build with egr delete, dpf delete. cp4 pump and all injectors are new including rail pressure sensor and fuel volume control valve on front of rail. all new gm parts no bs parts from other dealers. the truck will run beautifully until given any load, when driving if the rpms go over 2500 the vehicle acts as though the intake flap is closing, looses all power and will start to fuel knock. no smoke or data concerns that i can find. vehicles actual and desired rail pressure are spot on with each other and commanding 18 to 24k and actual matching when problem happens. even in park you can rev the vehicle up and hold it at 3k rpms or so and it will kill itself out and even stall. current tune in vehicle is a ez lynk 150hp, tried other tunes from same tuner to no resolution, also tried a hp tune and ezlynk from different writer and also a h&s to and all have the same effect. cam and crank sensors have been changed and relearned, fuel has been drained and filled with new, fuel filter and oil are all new as well as air filter. the truck will display the same issue with the intake flap held open and even with the vehicle run as naturally aspirated and the cac pipe at engine completely off. have sent data logs out to some people with no answers. looking for some advice on what i may be missing here or if someone can look at data files to see what i may be missing