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After changing my oil today I noticed one of my spark plugs moving around while the engine was on.
It was pretty loose.
I took it out and it looked fine so I re-installed it.
Could this have caused any damage? I don't know how long I've been driving around with it like this.
You might have worn the threads a bit. Keep checking the plug to see if it comes loose again.
Two of mine have come loose in the past couple of years, but I caught them fairly shortly after a plug & wire replacement. No damage that I can see, so far.