Q: Spark plug not working

A cylinder #6 misfire doesn’t necessarily mean the plug is bad. There are many other things that could cause a single cylinder misfire, from a faulty fuel injector to an engine mechanical problem. Anything that causes incomplete or abnormal combustion could be the cause. If your valve covers are leaking, there is a chance that the spark plug tube seals are allowing oil to get into the spark plug hole. This could cause a misfire and contaminate the plug. If the #6 spark plug is indeed causing the misfire, I suggest replacing all the plugs since the others are probably worn as well. I recommend having a professional, such as one from YourMechanic, inspect your vehicle firsthand. They will be able to determine the correct repairs and replace your spark plugs if needed.