CEL light on again. The right side ignition coil, voltage transformer and spark plugs are new. All was fine for 50kms after the replacement off parts, test drive and delivery.

  mercedes/cl-class/2007-2013

Hello, my 2008 CL65 has misfire codes-CEL light on, and the garage changed the right side ignition coil, ignition transformer and spark plugs. They advised all was fine now. Drove the car out and after driving a total of 60 kilometers the CEL light is back on. This happened when I pushed/accelerated the car from 80kmph onwards to 120kmph. Also had random vibrations thereafter. The car sounds a bit different  too on idle! What could this be?

thank you.

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