did you replace the HT leads with NGK ones with the plastic conduit "heatshields"? I just had exactly the same issue, the diagnostics pointed to coil pack failure. I fitted a new one and the issue reappered. I then changed out the plugs for the bosch iridium ones and fitted the NGK HT leads. the old plugs and leads were in a terrible state. as soon as i fired it up, the epc and traction control lights were gone and the engine was no longer shuddering at low revs. The plugs in mine had been changed in 2020, so i wouldn't rule them out if they have been in for over a year.