14 Verano, Diagnosis help

[Owlcapwn]

I have a 2014 Buick Verano, Other day heading to work car randomly started Shuddering at low rpm when you would get on throttle if i downshifted and got it above 2.5k it would clear up.
Car threw a check engine light followed by a service Stabilitrack notice on the dash limped it to work and towed it home. I got the scanner on it today and I'm getting multiple codes for Slow responding 02, high voltage issues 02, Misfire Cylinder 4. (I dont have the exact codes on hand at the moment) I couldnt find any codes in the transmission, the stability system, or any other system. I pulled the spark plugs they all looked the same and cylinder 4 wasn't wet or a significantly different color. I did pull up the 02 streams and at idle they were fluctuating from .48-.53 on bank 1 and bank 2 was staying around .58-.83. Bank 1 would randomly drop to .05v and bank 2 would drop to about .35v shortly after then come right back. I am having issues pulling Data from the ecu I did clear it and take it for a small drive to see what would come back and when all the lights came back on and it threw the alerts it froze my scanner so i wasn't able to see what changed. Any insight would be appreciated I'm honestly not sure where to start and don't want to just start throwing parts at it.

 

[egpowers]

Sounds like you need to replace the O2 sensors

 

[Owlcapwn]

So update it seems to be fixed, I'll take it to work tonight and see how it does. I ended up replacing an injector which fixed everything, reason i choose to do an injector was because i couldn't get the misfire to move off cylinder 4 even with playing musical coils and new plugs i had laying around. In my past experience when 02 sensors had died it would cause a misfire across the board or sporadically across multiple cylinders or just throw some lean or rich codes depending on how they failed never just caused 1 cylinder to severally misfire while the rest were fine. So i opted to gamble on the injector and it fixed it, also side note I didn't know this until a buddy of mine who is a gm tech told me that the Hard line from the high pressure pump to the fuel rail is a 1 time use only part and that it should always be replaced if taken off.