Grand marques is running rough on takeoff check engine light came on replace spark on 2 stop for little start back

Asked by Jul 19, 2015 at 02:34 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

3 Answers

67,445

Unless you just recently did a tune up never replace just one spark plug. Replace all 8. Especally if you have over 90,000 miles on the car and don't know when it was last tuned up. Most likely another plug has failed. What trouble code do you have now? HTH. -Jim

None now still running rough 180000 miles did tune up six month ago

47,765

It may need new coil on plugs (cop). Have the engine fault code read at a local parts store and post them here.

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