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2010 Mercedes c300


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My question is I took my car to auto zone, put it on the scanner cylinder 1 had a misfire I drove it to work the next two days then it started knocking now cylinder 1,2,4 have a misfire, I changed the spark plugs, oil change, I tried to switch the coils around and got the same results, misfire in 1,2,4 cylinder can you help me figure this out 

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