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Discussion Starter · #1 ·
What would cause a missfire? Spark plug or the spark plug wire?
 

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I had this happen @35K miles. the spark plug wire was rubbing on the exhaust manifold heat shield. The insulation rubbed off, and the spark was arching to the heat shield instead and not going to the spark plug.
 

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I had a #6 misfire error on my 2010 Rubi JK at just under 1100, yes, eleven hundred miles.

Turned out to be a cracked OE plug.
 
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