1999 Mercury Grand Marquis - coolant leak that is causing a misfire repair
Watch as I repair a coolant leak that is leading to a misfile and rough idle on my 1999 Mercury Grand Marquis. The initial symptoms were the check engine light and the OBD2 code P0304.

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Finding Coolant Leak on 99 Mercury Grand Marquis

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99 Mercury Grand Marquis 4.6 misfire diagnostic and fix.

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Found Puddles Under Your Car or Truck? How to Diagnose Coolant Leaks!

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2004 Mercury Grand Marquis Intake Manifold Leaking Coolant

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Before Replacing Your $10,000 Engine, Try THIS $1 Vinegar Trick First (Mechanic HATE It)

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