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What is this green residue on spark plugs and coils?

highroller

Passed Driver's Ed
Location
NZ
Hey guys,

My Edition 30 GTI has been misfiring lately... I've fixed it by gapping my spark plugs to 0.025-0.027" and that helped a lot but it still stutters occasionally although the flashing CEL is now gone and its a lot smoother.

When taking out the coilpacks and spark plugs, I noticed this weird green residue inside the coilpacks and on the spark plugs themselves. My coolant is G13 which is pink but it does look like green coolant? I am running a stage 2+ revo map.

My suspicion is oxidation but I'm probably wrong so any help appreciated! Thanks

Photos: https://imgur.com/a/wZHXCCC
 
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