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How Often Do I Need To Change My Spark Plugs? Spark Plugs are the main source of spark to Ignite the Air and Fuel Mixture in your Combustion Chamber. Without Spark Plugs your engine cannot run. Modern spark plugs are designed to last a long time. Depending on your vehicle they could last 30,000miles, 125,000 miles, or anywhere between. As spark plugs start to deteriorate it can cause many issues in your engine. The most common is a Misfire. This is when the Air and Fuel Mixture in the combustion chamber does not light when it should. This can cause the engine to Run Rough, Fail to Accelerate Properly, or even Die Completely. A misfire can also cause costly damage to your engine or exhaust system. At Priebe's Auto Clinic we keep track of when each vehicle is due for Spark Plug Replacement. We also track many other Maintenance Services that are due. Completing Maintenance, like Spark Plug Replacement, in the correct Intervals helps to keep your vehicle in great shape longer. Call us anytime to get an appointment. We can check your Spark Plugs to see if they need to be replaced.