Engine miss

[irace007]

Just picked up a 1997 528 I. It has a miss at idle its only running on 3 cylinders the back 3. If I rev the engine for a while it clears up and then runs
fine. Any suggestions

[IAmCman]

wat

[IAmCman]

wat

[wileoutz]

wat
what? yeeeaaaaah okayyyy

and about the misfiring check valve cover gaskets

[IWannaBMW]

clean your mass airflow sensor and check plugs for signs of oil on them