could be vaccum line knocked off, and there is a little cylinder type thing, cant remember what its called, that is attached to the arm of the intake, (maybe the throttle body, havent looked in a long time) Take that cylinder off (two bolts i think, easy) and unplug it (it has a plug in it) and clean it out w/ carb cleaner, and also maybe your throttle body plate may be dirty and sticking from whatever - but my IAC i think it is, Idle Air Control, when I messed w/ throttle body or the induction, it ended up being clogged and i had to carb clean it, and it ran fine after that.... start there, and listen to these gurus here cuz they'll have your problem solved in no time if I havent....
Paul Perreca