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Why is my #3 cylinder misfiring after replacement parts

(1999 Ford F-150)
in Louisburg, KS on February 16, 2012
i replaced the plug, plug wire, and the coil pack and i still am getting a misfiring problem i have hooked it to the computer at the local shop and its stating it is the 3rd cylinder that is misfiring will someone help me i neeed to get this addressed before i fry the rings or anything else at that matter
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