The appearance of #2 plug is very different to the others, so simple diagnostic common sense suggests that something different is going on in that cylinder. See below from the first google hit I got on ash on spark plugs..so, a possibility that valve guides on #2 are suffering?



Ash (Lead) Deposits
APPEARANCE: Ash deposits are characterized by light brown or white colored deposits crusted on the side or center electrodes. In some cases it may give the plug a rusty appearance.

CAUSE: Ash deposits are normally derived from oil or fuel additives burned during normal combustion. Normally they are harmless, though excessive amounts can cause misfiring. If deposits are excessive in short mileage, the valve guides may be worn.

RECOMMENDATION: Ash-fouled plugs can be cleaned, gapped and reinstalled.

 

Hmmmm... I do have a hard start problem that may have to do with a leaky injector. That could be on #2.

I'm not sure if it was ash deposits though... To me it looked like ash comparing it to other pictures. I def know it was bridged.