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Old 02-12-2005, 03:32 PM
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SLK230 (99) poor gas mileage

I replaced the plugs in my SLK and the gas mileage has dropped to 15mpg. I used the Bosch platinum +4 plugs ( the same were in it before) . What could be wrong or what do I need to do now?

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Old 02-12-2005, 03:57 PM
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Put your old spark plugs back!!!

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