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Have replaced coils and plugs and checked for air leaks . 4 of 6 cylinders are working.

Vehicle: SLK 300 . 2010 Mercedes-Benz

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Hi there,

Here is a list of all possible causes for a misfire code. 

P0300 MERCEDES-BENZ - Cylinder Misfire Detected Random Cylinders

Read more: https://www.autocodes.com/p0300_mercedes-benz.html

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