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Chevrolet Trailblazer Spark Plugs Available Here. Spark plugs are like lightning bolts for your vehicle. They carry a spark of electricity that fires the combustion needed for ignition. They put the pistons in motion so that, once started, your vehicle can power up, stay powered and operate efficiently. Healthy spark plugs are essential for optimum engine performance. Without a strong spark, your engine won’t run efficiently. In addition it may have trouble with cold-starting or misfiring under acceleration. A weak spark, caused by worn or faulty spark plugs can also cause a drop in power and an increase in fuel consumption. Replacing your spark plugs is a relatively cheap and simple job that should be done at regular service intervals