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Merc c230 auto sport: When I put foot to floor it now starts to misfire. Should I replace sparkplugs?

It is a 2.3 litre sports model with a supercharger. When I drive normally there is no problem, its only when I floor it and it kicks down it seems to misfire so I can't get it to accelerate well. Then for a few seconds even normal power is lost a bit,


yes but also fit a new set of high tension leads as a miss fire under load as you describe is more often than not down to the leads braking down

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