SeanHIS300

So, I have changed all spark plugs, wires, connectors, and coils. Ran into a little issue with a broken screw but JB weld fixed that. The car was running great 2 days after repair, then yesterday the engine came on. The Track is off. Cars seems to be running fine. I have been on FWY and sideroads. It takes off well and seems more zippy. But the tester shows me:

P0302 misfire cyl 2
P0420
Any ideas?
Thanks in advance, I a new here and new to DIY on the IS300, so please dumb it down for me.
Sean

daddystop

I'd clean your maf and check that your o2 sensors are cycling voltage properly.