Mystery shudder

Fantastic! I had a Honda that had a bad plug (2 cylinder) and it would run great at 4000 or better but miss terribly at anything lower. New plugs fixed it. Those sleeves are fiberglass, they are a great insulator.....? That is a beautiful color, same as my SC400. Whats it called?
It is actually a Mercedes color - It is called Firemist Red and it was used on 2000's sportier Merc's. Homemade paint job thou with O'Reilly's paint. Cheapo....