With spring weather around the corner, it's a good time to get your snowblower prepped and ready for storage so it works as good as new next winter. What's the most important thing to do, according to RepairClinic.com? Replace the spark plug, even if your machine is working fine. The spark plug is designed to last for one season, and given the enormity of this season's snowstorms, it's a good idea to replace it. A degraded spark plug actually increases greenhouse gas emissions, reduces the engine performance and increases fuel consumption. That one tiny fix can save you money and help the environment.