hi guys.

Randomly crank the car on today and a p0303 comes up. car idles very roughly, lot of faint popping from the exhaust at idle. feels fine during WOT.
I decide to log and find that the highest logged AFR reading I get is 11.7 through the rev range (up to 7k). Cobb AP doesn't read below the 10.0 threshold, so idle AFR looks to be 9.x.

I'm assuming the course of action is a retune and new spark plugs?
Should I stop driving the car completely?

 

How does the Cyl #3 plug look like?

 

didn't get a chance to take out the plug yet. I don't have a torque wrench, and don't want to subsequently tighten it to anything but spec...gonna check it tomorrow.