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It is probably an ignition problem. Check the mis-firing cylinder's ignition cable from the distributor to the spark plug. A quick check would be to replace the ignition cable on the mis-firing cylinder with one from a firing cylinder. That can rule out the cable. You could have also have a broken or fouled plug. or a bad distributor cap. Carbon tracks inside or on the outside of the cap can allow the spark to jump to ground. If it isn't that, then you have a collapsed lifter or something more expensive.

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โˆ™ 2009-01-04 20:12:27
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Q: Why does one cylinder missfires on your Kia Optima 2002?
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