can't recall when exactly the AAV's went away - but what you're describing sounds like a stuck or disfunctional aux air valve - if you've got a bentley manual it'll describe how to remove, check, fix and re-install it - it's pretty easy (as I recall it was on the back side of the intake manual on the right side of the car - sort of a pia to get to) - it'll have an air hose (about 3/4") going to/from it and will have a two wire connector on top of it (which controls the opening / closing of the valve) - the valve should be OPEN when cold.
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