[gofastsandman]

Hey CSC,
Welcome to CSC,
Are you running a JohnnyRude? They require supression plugs or you risk blowing expensive electronics. My 150 calls for Champion ql78yc supression and nothing else. It didn`t idle great and I called Monty Racing as they make serious power with Rudes. They recommended ql77jc4 plugs and they are much smoother. I would not run those plugs. The heat ranges vary greatly among different brands and you could risk preignition/detonation and blow the pig. I am not fond of Champions, but you gotta run em.

Cheers,
GFS