How often do spark plugs need to be replaced? Japanese Car Oil Filter manufacturers & suppliers,Auto Engine filter 17801 30060 HKS Racing M Series Spark Plugs (Set of 6) Worn spark plugs can cause poor performance, misfiring, and higher fuel consumption. Replace them when you notice rough idling, slow pickup, or engine vibration. Thank you for choosing #ELZBrunei . Visit your Spark plugs technical know how TekniWiki
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spark plug vibration Investigation of effects of spark plug gap on vibration, noise and HC emission in a gasoline engine