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Cylinder specific misfires are usually caused from one (or more) of four things. The spark plug itself in that specific cylinder may be fouled out (have oil on or blackened tip). Incorrect gap (distance from end of plug to metal "L" shaped piece) or just faulty or worn out. Also the spark plug wire / cable running to that specific cylinder may be broken, burnt, cracked or just worn out. The distributor / rotor cap may have a bad node on it that the specific plug feeds from or may be bad all together. some cars have coil packs that go bad and can cause misfire.
Also if the check engine light is on you should have the code scanned / read and follow the diagnostic process for eliminating the skipping.
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