Answering my own question. Checked for vacumn first and noticed that it did exist. Checked the hose and noticed a small crack in the hose above the flapper valve, enough for the flapper valve not to work correctly. I did not like the sound it was making. Cut about .5" of the hose (at the line of the crack) and refitted it. This corrected my problem. Its kind of difficult to work in the area of the flapper valve. I know there is a lot of heat in the area. Is this a common occurance for a vehicle with 30K miles on it?

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1