09 Audi A4 P2015 code and vacuum leak

Code p2015 and fuel trim too lean codes. Massive misfire at idle

[@pairISweakNESS]

What is this part called? Please let me know as it keeps coming off on its own, When i put it back in car runs fine.

[@kambesama]

Safian A. No specific name. It's part of the intake manifold. Have to replace the entire thing.

[@ecsurferchik]

Seriously?