i had same issue and took the car to dealer and they gave me a middle finger with a quote asking 1800. i asked for break down and they said 400 for part and 1400 for labor. so i just towed the car home and changed the sparkplug to ngk but tbh i think oem is better. you can use ngk if your planning to run e85 on it. Your misfire will be fixed but after little bit you will face a major issue. i will upload the video later when i have time
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