Welcome to THE WIRE <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />
and from a fellow Louuuavullian...I left there in '98.
Any used vehicle will have it's challenges, that's part of the fun of wrenching and modifying.
You'll find once you get some buggs worked out you'll have a vehicle to kicks all other 4wds butts.
This problem could be as simple as needing a good trottle body cleaning,,,and possibly a new Idle control servo.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.