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Q: What is causing my engine misfire?

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my 1995 mercedes c180 developed a missfire i have changed the spark plugs it is still the same. a mate who is a qualified mec said it could be a burnt out valve but did a pressure test and every thing came back ok. he said it was the coilpack he replaced it and the problem still there. with the old coilpack he said it was missfireing on no4 plug with the new pack he said it is doing it on no3. so i have ordered another one . is he missing something????? any help wpold be appreciated

My car has a manual transmission.

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