Mercury Marquis Engine Poor Mileage
BackfireBurning OilCompressionGasHard to StartHesitateIdle ErraticIdle HighIdle LowIdle RoughKnockLeanLocked UpLoudLow PowerMisfireNoiseNot Cranking OverNot RunningOil LeakOverheatPoor MileageRattleRevs UpRuns HotRuns RoughShakesSmellSputterStall While DrivingStall at IdleSurgeTapTickVacuum LeakVibrationWhine
2000 Mercury Marquis UNSOLVED HORRIBLE GAS MILEAGE...
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1990 Mercury Marquis Poor Fuel Economy
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