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lawn mower runs best with plug wire 1/2 in front of plug, why?

lawn mower runs smoothly with plug wire about 1/2 inch in front of plug. Connect plug and it stops running.
Al from Streator Illinois, April 2010
If it has a metal plug cap it is earthing out, a common problem on some Briggs engines, replace the plug cap for non metal version.

Husqvarna man, April 2010