While towin with my comp on 5 the truck looses power then comes back a little, almost like someone is changing levels on the comp. Today I got after it on a bridge and it sounded like it was missing slightly. My fuel pressure is low, aroud 5 psi at wot, could I be starving the pump. Also it only does this on 5x5. Thanks

 

Yup. Sounds like it. I'd change lift pumps first to see if maybe your just starving it of fuel (a very likely possibility).