2018 Yukon 6.2 strange sound

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finston

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This issue started yesterday while driving. Engine light, loss of traction control and forward collision system.
Pulled into park and have a very rough idle. First thought was lifter failure, which I had almost two years ago to the day. But this noise was coming from underneath the driver floorboard. Sounds like metal rattling in the exhaust. Nothing like the lifter noise that I had experienced before and where the noise was pronounced in the valve area of the top of the engine.
The goes away at an idle, but intensifies when giving gas. It isn't rhythmic but more random. Does anyone have a clue what it could be? Code reader says misfire cyl 6. I got towed home and let it cool off. Started up, light was off and no noise. After idling for 10 minutes, misfiring starting again and the noise again. There's a video that you should be able to hear.


Thank you all
 

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