Mild hiccups when accelerating

[Cummins guy]

Hi there I am new to the forum and I have an issue with my 98.5 Cummins.

Under light exhilaration, it hiccups More so it speeds up without moving the pedal then returns to normal. If I am heavy on the pedal it operates just fine. A coasting speeds its does the opposite it acts like I am off the pedal when I haven’t moved it.

Any help will be greatly appreciated!!

Thank you!

Info 24V with 352k 17 psi before vp44
New fuel filter raptor 150 lift pump and vp44 with 60k on it.

 

[Bigtman07]

It almost sounds like either 1: you have an injector cutting out/cracking 2: possibly the transmission slipping. Its a remote possibility but could be the VP having Air in the lines. I had a similar issue before I ditched the Raptor and went to FASS. Mine turned out to be air in my lines.