...just fixed mine, haha, it's a vacuum leak. Look right underneath your hood along the bottom of your cowl. It's hard to explain, but look around for a small disconnected hose mine was an adapter, I just cut the old piece of hose out and reconnected it. Email me with questions and I'll pop my hood and see if I can give you a better description. Good luck!!!
WOW is this the best fourm or what i had this proublem happen to me today and thought OH Boy whats this gonna coast then i did a search looked at this post and 5 min latter my A/C is blowing were it should you guys are great thanks so much i love this place