Tapping sound is coming from engine bay. Car has "System too lean" bank 2 code along with multiple bank 2 misfires.

No noticable loss in performance (car's new to me so who knows)
Hard start (with surging idle that smooths out)
Idle surges when coming to a stop.
Crappy gas mileage - 12mpg

Oil changed
All New plugs, new coils in 5 and 6
Camshaft sensors replaced
Vanos solenoids cleaned.

134k mi

Help me narrow this down.

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