Just checked my coilpack as I have a misfire on boost. The pins for 1, 3 and 4 are gold but 2 is greyish and dull. This where the problem is or is it normal? I'm guessing not so changed it for another I had but wanted to check before driving.

 

I still have the misfire coming on boost. Changed leads to other ones I had too and checked plugs. Seemed fine tbh. I looked into the cylinders when I had plugs out and there was at least 1 with tiny little gouges in the piston surface. Maybe 1mm long and a few of them just breaking up the surface smoothness. Is this normal or are pistons maybe fucked?