First thing to address is the check engine light. Most times on these cars the only thing to trip the light is the o2 sensor. The car is likely running very rich or lean.

Next is to give a full tune up. Cap, rotor, wires and plugs. I would check the vacuum as well. You should have a min of 12hg, ideally 15-16 at idle.

That hose that connects from the airbox to the valve cover won't help your running issues, but should be addressed anyway.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2