Catalyst sensor not working?
 

I have been trying to diagnose my random misfire issues and yes my code scanner is showing me misfires on all cylinders. However, my bank 1 cylinders have about 3x as many misfires on them as my bank 2 cylinders. I was looking over the freeze frame data today I see SHRTFTB1S2 (%) showing "N/A" while SHRTFTB2S2 (%) is showing 99.2. I know Sensor 2 are the sensors behind the cats and my code scanner as well as UpRev will show voltages coming from both post-cat sensors therefore I am wondering if this N/A is a sign of a problem and is related to my heavy misfires on B1, is it just my code reader maybe not properly interfacing or is this normal on our Nissans for this "N/A" to be there? Please see picture.

Did you change your spark Plugs recently?
 

Did you change your spark Plugs recently? I did and got counterfeit ones from Amazon. The electrodes melted and the car mis-fired terribly. I went back and bought the genuine ones and the trouble vanished.

Just a thought, if nothing else leaps out at you.

It has had the GTR plugs in it for a while, bought them Summit. Last time I had them out to close the gap ever so slightly the plugs look like they are burning well.

I also noticed that Fuel Monitor is not getting ready. Being this is a continuous monitor I would think it should ready right away just like the misfire monitor. Thinking may have something electrical going on.