[Honolulu]

Mechanic's rule: look at the stuff you last "worked on", you may find yourself there again. No shame, we all learn this way, multiple times.

Check your intake hose elbow for cracks, also other hoses which could induce an unmetered air leak. Check the hoses to the idle air control valve, and the valve itself. Bimmers have a habit of clogging the IACV, and it needs to be cleaned.