It's highly doubtful that it's an intake leak. That would not cause one cylinder to misfire. It would affect BOTH. It could be the coil. The wires are not replaceable. They are made on the coil. You sure it's a misfire? Didn't break a rod did you? Or perhaps lose/bend a pushrod? I'd check for spark first. If you find it has spark, the do a compression check. Please, stop mowing with it. If you continue to run it you will only damage the motor worse.
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