Thanks for all of the helpful replies. Can anyone tell me, how do you adjust fuel/air mixture?
jsawduste- you got it, that's my problem in a nut shell. Maybe it will help you or someone diagnose my problem by telling you this ---> When I got the jeep it wouldn't idle, so I cleaned out the idle tubes, and put them back in (I did NO changes to anything else on the vehicle whatsoever other than clean the tubes and put them back). This marks the exact moment that my YJ started to diesel. I probably should have mentioned this fact earlier cause it seems like good evidence for my problem.
By the way, I found a cracked hose and replaced it, my idle is now down to around 900... Still diesels...
Once again my YJ is a 4.2L with the computer.