Spark plug wire burnt?

Teg4u

New Member
This is on my d16z6 civix but it's the same concept. So my car was bogging at low rpms so I noticed the distributer cap was cracked at where you stick the plug wire in and the metal on the end of the wire was black. Then I looked in the spark plug hole on the head and that was black too. I wiped it down and drove it and it drove perfect. The plug hole still doesn't look normal so what would cause this
 
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