i recently started hearing a ticking noise from my engine after a quick investigation i realized it was comming from my last spark plug on the right, it vibrates. i took it out and its all burnt up white on the tip and black crap all around the middle part and on the other end that the wire goes on. the wire also is light burnt brown unlike the others ( all black) i have ngk iridiums, 4 culinder engine. what do i do :(
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