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I am assuming the light came on only after you performed the maintenance.
I had the light on before and then performed the plug and wire replacement. However, the light remained on. The reason this happened was because the light for this failure code must be cleared by a code reader, it does not clear with the elimination of the problem.
I had to replace my Camshaft Position Sensor last year. The light cleared by itself for this failure code.
What this boils down to is that you must be able to clear the code after (or sometimes during) your troubleshooting. The light may have come on if the wire was not on correctly. Even though you have since placed it on the plug, the code must be cleared. If the plug or wire is faulty or marginal, then if you move them to another cylinder you should get another cylinder misfire error. If this happens then you can move just the wire to a good cylinder and see what happens to further isolate between the plug and wire. Then you will need to perform the repair and then clear the codes.
I purchased a CarChip module that allows me to monitor many engine parameters, my son's driving habits (speed and braking habits) and to clear error codes. The Autozone store may be able to clear the code for you since you may not have a problem any more.
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