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Are you sure the plug is cracked? Mine was being blamed on a cracked plug but what it was the boot on #4 plug was carbonized causing a small black line down the plug.if I changed the plug it would run good for a week or so then miss again.I changed #4 plug wire (boot under coil) and the problem stopped.

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โˆ™ 2006-04-29 22:42:32
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Q: Why does number 4-cylinder plug crack on stem on a 2000 Kia Sportage?
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