I was having a small hesitation in my engine between 45 and 50 mph, so I decided to change spark plugs. When I started to pull them out there was oil and gunk in the tube. I have been told that the spark plug tubes are leaking and I need to replace the tubes. Has anyone done that? I can't see how to do that?

 

It's the valve cover seals and spark plug boss seals. Do a SEARCH, plenty of threads.

Example =

https://www.jaguarforums.com/forum/x...k-plugs-18291/

 

Ok. I see it. Thanks.