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The most common signs of bad spark plugs include start-up trouble, rough idling, sluggish acceleration, declining fuel economy, engine misfiring, and engine knocking. Failing to replace your spark plugs on schedule leads to poor performance in the short term, and potentially to serious damage in the long term, so don’t make the mistake of putting off service! If you’ve noticed any of the following signs and symptoms, schedule service and let us take a closer look today.