Did you replace with exact Benz specified 'plugs? I've had Audi issues when not going with same and Benz likely similar. Also of course be sure to check the gap with a spark plug gauge and verify appropriate against your vehicle spec's. Don't just trust them as packaged.
Spark plug wire insulation (aka High Tension HT-leads) can become electrically porous over time and lead to "cross talk" causing a misfire. So 'plugs and coils was a good step but new cables would have also been prudent.
A Benz dealership can use their proprietary diagnostic tool to give you a more complete code readout.
Spark plug wire insulation (aka High Tension HT-leads) can become electrically porous over time and lead to "cross talk" causing a misfire. So 'plugs and coils was a good step but new cables would have also been prudent.
A Benz dealership can use their proprietary diagnostic tool to give you a more complete code readout.
