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Q: 1st and 4th plugs becam dark than 2nd 3rd on 1999 Toyota Tercel

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
when i check plugs,carben were diposited more in 1st 4th plugs and staind with oil
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