Question about 1996 Mercury Grand Marquis

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First it was filing out plugs but found out i can only use motorcraft, but today i put motorcraft platnums in it and its still back firing and shaking. wat is my problem? wat would make it back fire now that i have good plugs?

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Sounds like you might need a complete tune-up, coil, wires, rotor and cap, it appears to be a good idea to go to the shop for a complete fuel system cleanout, they'll remove all of the carbon buildup in your system and your fuel economy will increase.

Posted on Oct 06, 2010

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Posted on Jan 02, 2017

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