Sorry - the symptoms I mentioned would be for if the elbow were to split open and leak air. If it's only collapsing and not leaking, you wouldn't get a code unless it collapsed enough to greatly restrict or totally shut off its air flow.
No name that I know of. Everybody just calls "that vacuum elbow on top of the plenum in front of the throttle body".
My guess is that it's the exact same part as on the 2.7. Post nos. 2 and 3 give a part number for a Dorman part that supposedly fits, and a suggestion to consider finding a factory one in a salvage yard with some 2nd gen LH cars.