Question about 2001 Volvo S40

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D40 2001 s40 volvo, 65,000 miles. Struggles from 50 mph to 60 mph. Dealer believes the behavior is relevant to a D40 code? Maybe misfiring?

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Could be the spark plugs not gapped enough.if they are gap less than indicated then u will noticed when going at higher speed.

Posted on Sep 19, 2008

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