Question about 2002 Mercury Sable

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Replaced plugs,wires,coil pack and still have the same miss. Noticed at 1500 rpms smooths out, anything above or below this misses bad. Originally the code said misfire on number 3 cylinder. No codes or lights present now. But still missing. We are gonna do a compression check today. Would appreciate help.

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Pull all plugs for compression check /turn engine over fore 5 sec for each cyl,should be 10 lb and no more from one to the other .
tim

Posted on Dec 12, 2009

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