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Old 07-01-2014, 09:18 PM   #20
Terry,OH
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Join Date: May 2010
Posts: 4,785
Default Re: changing plugs every 100 miles!!

It does sound as if your running too rich. Do you know the size of the jets and the power valves in the two 97'S??? Does the engine use oil?? You may want to contact Uncle Max for his suggestion on jet size, he was spot on for my 2-97's Send him an email or personal message here on the ford barn.
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