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Spark Plug lighting up

43_lx_merc_1996

Regular Contributor
"Yesterday I noticed that one

"Yesterday I noticed that one of my spark plugs was lighting up (at the base of the porcelain section) with every spark. The engine (AQ260) runs fine otherwise. No misfires & plug wires are tight.

I'm guessing this is not normal? Any ideas on how to fix?

Thanks,"
 
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