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  1. Ford Crown Vic, Mercury Marauder, Grand Marquis
    So recently I've been getting really bad gas mileage in my '97 crown vic and it didn't have that issue before I took out the spark plugs, And put brand new ones(Motorcraft SP-432 AGSF32FM). I did make sure they're gapped properly to .54mm. I also replaced the fuel filter, air filter, cleaned out...