Hi all,
Long time lurker - finally had to make a post after this issue I've been having since March.

My G35 Coupe has this rough idle going on since March, where the exhaust sounds like its sputtering. If I give it gas in park, it will also do this sputtering as well. However, when I am driving it, it is not noticeable. The exhaust smells a little rich, and it is throwing a pending P0306 (6th cylinder Misfire) code. The issue disappeared for a day when I did the oil change, and also goes away if I take it for a spirited drive.
I have replaced:
- EVAP Canister Purge Valve
- Rocker covers on both sides
- Ignition Coil
- Spark Plug
- PCV Valve

I have also ensured all vacuum hoses are on properly and that there are no intake issues. I cleaned the throttle body and did an idle relearn as well.
I have attached a diagnostic report from an OBD software to this post. Below are the videos I took, one from the engine bay (by Cyl 6) and one from underneath the car, under the rear muffler:

Any ideas on what the issue might be?

 

Have you checked your plugs yet, especially on cylinder 6?

 

Yup - It was a bit dirty. The threads had soot near the tip of the plug and the Electrode was a little crusty (brownish/whiteish crust on it). I cleaned the crust off and wiped off the soot and it was working fine. The coil boot had no oil on it at all.
I tried to run the engine with the coil pack unplugged and it ran much worse, so it sounds like the plug and coil were working.

 

So I went out and bought a MAF cleaner today. It was quite an adventure.
The MAF on these cars is in place with 2 Security Torx screws. That took me an hour to get out.

Anyways, cleaned the MAF, and I'm still having issues

I noticed that at steady RPMs, there is no misfire. However, as soon as the RPMs climb or drop, the misfire occurs. I'm starting to more think that its the injectors...

 

Vvt solenoids. Or injectors. Ohm check injectors. Should be same throughout. Unplug injector hook up meter set to ohms. Clean vvt solenoids.