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Those "Platinum Plus" Plugs are completely the wrong kind for that engine. Find some good standard plugs, either NGK, or Bosch, and put those in. Preferably the ones you get at a MB dealer. NAPA or autozone should be able to hook you up with some proper ones too. Bosch "Super Plus" would work much better. Platinum plugs are not meant to be used in that engine. Get them out of there ASAP.
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