The spark plugs are one of the most important components of your vehicle. They provide a spark to the internal combustion engine to get it started. If your spark plug malfunctions, then it will be impossible to start your car. Due to the nature of their work, the spark plugs wear out in due course of time. Like every other electrical component in your car, the spark plugs also exhibit certain symptoms when they start to go bad. Go through the slide to know more about the bad spark plugs.