Yep!
Yep there's yellow powder that looks like sulphur in the hole that the plug goes down into. I dont run octane booster but I do run nothing but premium gas. and it's only in one of the cylinders....?
Also when I first start the car in the morning I get a nice plume of blue smoke, Bad rings? Valve seals? PCV? It's only when I first start it, not all the time