[Dr Zoidberg]

I dont know the technical name for it, but in the "OLD DAYS" back when cars had a cap and rotor, You would find pitting or streaks of burned deposits on the cap where the spark found an alternate path through the plastic, from the rotor to the plug wire. It would arc through the plastic, due to micro-cracks in the cap due to age or defect.

While changing my spark plugs , on the tip of the # 5 cyl coil/plug assembly ( where the end pushes over the plug) , I notices powder like greyish streaks, that looks just like an arc path ( I know Im crazy but they look like a lightning bolt) , The could be rubbed right off.

It looks like the spark is bleeding out the casing before the plug and going to the head for a easier ground.

I found no other coil packs that looked like it,

Any ideas

Thanks
Geoffrey