Maybe a lot of water in the filter unit? Questionable fuel has made my truck sputter a bit like that. Drained the fuel filter canister and refreshed with a new baldwin filter and it was better, but didn't fully go away until i filled up with a fresh batch of diesel from a known good station i've used before. I don't know if that will do it or not, but maybe you'll get lucky.
The other idea that I had was I remember reading a post in here about a wire that was rubbing against the a/c pump and it rubbed itself raw and once it got electrical taped and zip tied, everything went back to normal. If i can find that post, i'll drop it in here for ya.
Good luck!
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'06 Inferno Red 2500 QC, Auto, 285 70 17 BFG AT KO's, Century Ultra Topper, CoolPipe, Icebox w/4091, Amsoil's in da pumpkins and xfer case.
