flashpaq and ddp injectors

[JExum]

i just had ddp 50hp injectors installed on 07 with superhips flashpaq set on performance setting. my problem is the truck acts like it starved for fuel going down the highway with the cruise control on no load. it has a shutter on inclines but idles real smooth and accerates great. runs fine on stock and towing mode. any suggestions

 

[R_Painter]

did you upgrade the cp3 and stock lift pump if not I agree the motor is running out of rail pressure. .