Hi, new to this forum...looking for some more learned input on a misfire issue I'm having with the Audi A8 d3 4.2 with BVJ engine. I was having issues with lean codes which turned out to be a damaged oil separator. Replaced that which cured the lean codes (and rough idle and transmission issues), but now I am having high rpm stuttering. Car pulls strong and smoothly at partial throttle but when I go to WOT, or near WOT, and RPMs get up above 4k, it starts stuttering. Codes show a 0300 random multiple cyl misfires and 0303 misfire at cylinder #3 (see below). I've replaced the fuel filter, spark plugs and cleaned/swapped around the coils with no change. Any thoughts from the experts here on what to check next? Thanks.

Address 01: Engine Labels:. 079-907-560-BVJ.clb
Part No SW: 4E1 910 560 A HW: 4E1 907 560
Component: 4.2l V8/4V 0040
Revision: 71H21--- Serial number: AUX3Z0G1716169
Coding: 01060009190F0120
Shop #: WSC 02313 067 57207
VCID: 2019EBC3B6C06DCBEF2-8074
VINID: 9D195C9841151077800462491C1F612727

2 Faults Found:
000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 -
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 196461 km
Time Indication: 0
Date: 2022.03.03
Time: 17:45:29

Freeze Frame:
RPM: 6080 /min
Load: 98.8 %
Speed: 94.0 km/h
Temperature: 78.0°C
Temperature: 17.0°C
Absolute Pres.: 980.0 mbar
Voltage: 13.716 V

000771 - Cylinder 3
P0303 - 001 - Misfire Detected
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 196461 km
Time Indication: 0
Date: 2022.03.03
Time: 17:45:29

Freeze Frame:
RPM: 6080 /min
Load: 98.8 %
Speed: 94.0 km/h
Temperature: 78.0°C
Temperature: 17.0°C
Absolute Pres.: 980.0 mbar
Voltage: 13.716 V

Readiness: 0110 1101