CM871 drag when releasing accelerator

[RMezaJr]

When I'm going down the road and I release the accelerator I feel a slight drag, similar to the jakes being on in the lowest setting. The truck has done this since I bought it and never paid much attention to it, but now I'm wondering if there may be a driveline issue, throttle position sensor issue or if this is how all trucks with a VGT turbo act.

Thanks