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However, when spark plugs become worn, they can start to introduce problems. These tiny components can start to cause lagginess, sluggishness, and other woes. Fortunately, all you have to do is swap out your old spark plugs for new ones to get your engine back on track. If it’s a job you’re tackling yourself, we’ve got a list of the best spark plugs you can buy to help you find the perfect fit for your engine.