Truck rpms jumping when i start

[skeetdawg03]

when i start my truck sometimes it lopes like its tries to die to low rpms... it just jumps up and down... sometimes it'll do it 2 or 3 times sometimes it'll do it untill i rev up the engine... it clears once i rev up... and only does it when i start the truck not when i stop or idle... doesn't matter weather its first start of the morning or weather its been run all day it does it randomly.... 97f-350 psd

First thing I can think of is get the codes checked. But I would say that it sounds like an IPR that is wanting to stick sometimes. Also if your truck is an auto I learned from Scuffy that the trans range sensor can intermitently do that.

[Jarrod B]

what about fuel pressure? can it be low at start up?

[skeetdawg03]

thats gotta be it then cuz I do have a code on my range sensor or neutrel idle switch .... saying high output... i replaced the neutral idle switch on the side of the tranny.... but still same problem... ... so where to next

[cfunderb]

It could be oil leaking back down from the HPOP resevoir and it takes a bit for it to fill back up.

[Jarrod B]

that could be it also.