TurboIIKid

Ok first of all thanks to the people who told me it was my alternator that crapped out on me, so i brought it to a local shop to get the alt replaced. When i got it back the idleing was jumping a litlle bit. Like from 800 to 900. As i drove home later one it was jumpin from 700 to 900 to 800 to 1100 back o 900. i was like wtf. So i broguht it back and they were checkin some hoses but couldnt fix the problem. Ne one have any ideas wat it could be?? I did a search on idle and nothing like my situation popped up. Thanks!