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Spark Plug Basics: Your Questions Answered 1. What do spark plugs do? Now, combustion requires a spark. Spark plugs are a crucial part of your engine because theyre what makes that combustion happen, both at ignition and while the engine moves through each combustion cycle during operation. When the plugs aren’t doing their job, your engines not getting the full combustion benefit. Everything from acceleration and fuel economy to engine smoothness is going to be negatively affected. How do...

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