need idle help
 

hey im new here im mostly a subaru guy but i saw this pathfinder for 100 bucks its a 94 it runs but when i start it it wont idle but if u keep it at about 2000 rpm it will go fine i can put it in gear and go and all but i have to keep the idle high any infor i replaced fuel filter that did help a little oh could it be an air censor plz let me know any help would be great thanks rob[:o]