Review on Champion Iridium 9806 Spark Plug - High Performance and Longevity (Carton of 1) by Eric Hanson

After driving my brand new Tundra for 10 years and installing faithful Japanese Iridium spark plugs several times, I decided to give the Champion Iridium a try. The difference was dramatic. I made sure to fire the plugs properly (they were all too tight) so I can't say it was just one plug. But what I can say is that the engine, which is still very smooth, runs smoother than ever and goes full throttle on a 30 degree incline without hesitation. (The airflow sensor is quite sensitive to the efficiency of the candle glow and will fluctuate when the candles aren't in the best condition!) The transmission also seems to shift faster and smoother now. I am planning to replace the Azera and Sonata spark plugs with Champion Iridium. Thank you champion!