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foul

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    Spark Plug Fouling

    I have a 93 explorer 4.0 My spark plugs fouled up on me, so i cleaned them and put them back in. I drove about 15 miles and they were fouled up again. When they foul they have a dry black residue on them and they smell like gas. When i clean them up and put them back in, the car runs great...
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