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What would cause a surge at steady speeds in a Ford Explorer?

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Answered 2007-08-31 09:22:54

Both a friend and I, each driving 1995 Ford Explorers with the 4.0 L OHV engine, developed an off and on surging problem at speeds over 37 MPH. The problem was corrected by installing a new set of Ford Motorcraft platinum spark plugs. In my situation I only had 41,000 miles on the original plugs but 2 of them already had gaps wider than the specified range.

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