Question about 1999 Lincoln Town Car

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I have 2000 tow car. just recently change sparks plugs,for wee or two i get good gas miles. around 23, 24 miles per gallon on highway, then all off sudden i start getting 18,19 miles per gallon on highway , please tell me what other thing i should do proof my miles, air filter is clean pcv is good coils are all good, can bad egr valve give you poor miles, if it does how can i check for bad egr valve

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Check the torque on your plugs, should be around 15 - 19 lbs - consult spark plug manufacturer on the torque - if you did not torque them enough, they may have become loose. Also check coil packs - make sure all plug wires are snug.

Posted on Nov 06, 2008

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I hope this help on your question.
Thank you for use fixya.

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