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Questions

Is it ok to only replace a single coil or should I do the others as well? How long are they expected to last?

Do you think the bad coil would have caused any damage to the spark plug? Maybe it's time to replace my plugs anyway. They have 3 yrs and about 35k miles on them. How long do plugs last?
I would replace all the coils while you are at it, I had 1 coil gone bad and a couple thousand miles later, some other ones went bad as well. So from my experience, just replace all of them.

I would replace the plugs too while you are at it, they are cheaper than the coils, it's about time after 35k miles too.
 
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