Welcome to the forum. Look like you have a spark plug tube leak. A great opportunity to replace spark plugs and inspect the coils for cracks. Check out this post:
https://986forum.com/forums/diy-project-guides/52150-spark-plug-tubes.html
And here's a spark plug DIY from the forum sponsor:
https://www.pelicanparts.com/techarticles/Boxster_Tech/07-ENGINE-Plugs_-_Coils/07-ENGINE-Plugs_-_Coils.htm
Here's some bad spark plug tube leaks on a 1997 986 I bought:
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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