Last week the check engine light came on, along with the vas light, and the car drove like crap. I found out spark plug 2, the electrode had broken. I got it replaced with NGK iridium plugs but my concern is, plug 2 was completely gunky. The other 5 were not gunky. You could actually see the white on the electrode. I would expect all to be at least some what the same gunky. Why would plug 2 be so much more gunky than the other 5?