Codes:
P0306 - Misfire Cylinder 6
P1314 - Misfire Rate Catalyst Damage Fault - Bank 2
P1316 - Misfire Rate Exceeds Emissions
P1111 - System Pass

I changed the spark plugs a couple months ago, should i also change the ignition coils? It idle's kind of rough in the morning when starting up, but after 10-20 seconds, its purring like a cat.

 

Update on SIC Kitty..
I have a coolant leak, i checked underneath my drivers side and found where its leaking. could this be an issue with the water pump?

 

Take the battery out then you can see the water pump. If it's coming from there you'll be able to see it.