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Discussion Starter · #1 ·
My car backfires sometimes when i hit the gas hard. I all the spark plug and all of them have black on the threads and a whitest gray color on the tip and that metal thing on top of it. ...These were new spark plugs. ANy ideas on what's wrong with my motor???
 

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Discussion Starter · #4 ·
It only have black on the lower thread towards the the tip.(not on the tip) Hmm.. you said that whitest gray color on the tip is normal or running rich. So what could have cause my car to backfire??
 
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