[phattyduck]

that kind of looks like a rubber boot or plastic from one of the coils, the pic isn't ideal.

I would agree with this assessment. It is part of the spark plug coil boot. Pick or pliers to get it out, then normal spark plug removal should be easy.

-Charlie

 

[phattyduck]

I think it's the rubber inside the spark plug socket (designed to protect the spark plug when you pull it out). Get a spark plug socket with magnetic inside and you won't have this issue again.

Funny thing, my magnetic spark plug socket is a bit to strong so it can pull out my extension if I'm not careful... still much better than the rubber insert style. Its also a good idea to hit the spark plug ceramic with just a bit of dielectric grease / silicone lube to allow the spark plug boot to pop out easy the next time.

-Charlie