1996 Audi A4 2.8L
125kmiles

Been chasing the misfire demon. Getting p300-p303. It is idling very rough. Changed the coils and plugs, made some improvement but the misfires are still there.

While checking some vacuums tonight, I had the fault codes cleared. Turned the car on, idle was fine, revved up, the more I revved, the worse the idle got when I stopped revving. Came back to a new fault code. P1101.

I know the code means an O2 sensor but how does this relate to my misfire?