best spark plugs for an 2004 2.2 ecotec engine
Contrary to what manufacturers claim, I found that not all spark plugs perform equally in a 2004 2.2 ecotec engine. After hands-on testing, I discovered that some plugs deliver smoother idling, quicker starts, and better fuel efficiency under real driving conditions. The key is a balance of durability, spark stability, and corrosion resistance. Among the … Read more