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  1. John Crist

    Engine Wrong size spark plug?!

    My original thread is located here: http://mustangforums.com/forum/4-6l-1996-2004-modular-mustang/691567-rounded-plug-in-cylinder-8-other-plug-problems.html Originally I thought my spark plug was rounded out in a Mustang I recently acquired (01 GT Convertible). After some tinkering, I found...