Sounds like a UVCH wiring issue. Shouldn't be too hard to diagnose. Replacement wiring and/or valve cover could be had for less than $100 used. A scanner that can do buzz and cylinder contribution tests would be more illuminating. The cam sensor reference in the ad is, of course, mistaken.
'Course, it could be anything. Could be bad injectors on that whole bank, or an IDM issue. Stlll, a 4x4 CCLB in good shape can go for $6000-10000, depending on provenance and condition. Is it a 5-speed? Wait -- hard to tell from the pic, and it's typical "bonehead craigslist" posting style to omit the most obvious major items that define the truck - tranny type and whether it's 4x4.
Last edited by madpogue; 10-25-2011 at 09:15 PM.