[duramaxdavid]

Do you have mods?

lift pump instead of aux transfer pump i think is what youve heard. If you have limped the truck that wont help. Limping is a personal problem.........oops wrong limp...........limping is when the transmission slips enough to , well limp it, you wont be able to go over 2k rpms in limp mode. If you turn off your truck it usally resets limp mode.

A lift pump helps if your running tuners that suck the fuel system dry.