So today on the way home from work the car started running really rough, almost to the point of stalling. I mananged to get her home and even had codes checked (check engine light came on after). Codes:
3rd cylinder detonation (knock?)
I pulled the sparks and 3 looked like this:
The third cylinder looked like this:
recently replaced the battery. Alternator was replaced 6 month or so ago.
What are everyone's thoughts?