Car stalls at idle...please help...?

I have asked on here before with much help which i thank you for, but i have not yet solved my problem. i have a 2000 ford taurus with the 24 valve duratec engine and only when i am idling my car idles hard and rough like its choking and then stalls out. My car actually bucks a tiny bit too while its happening. Ive narrowed it down to 2 possibilities...The IAC motor or the PCV valve and or hose. For more info, follow the link to see the engine. Pay special attention to the hose, it feels and looks broken down. Also, the location of the hose is directly on the underside of the air intake system, the IAC is on the opposite (top) What hose is that AND could that be the problem? a href="http://www.flickr.com/photos/35070685@N05/" rel="nofollow"http://www.flickr.com/photos/35070685@N0…/a My car has 130,000 miles appx. and i cleaned the throttle body plate as well as took off the IAC to check it (IAC did not even look dirty). Thanks for your help!!!