see what’s up? It’s also possible the issue is with the wiring connection at the PTU. I’d use a meter along with the factory wiring diagram to verify all the coil pack connector pins are actually connecting (going) to where they are supposed to go in the engine bay.
Otherwise you are just guessing about the issue.
PS - with engine idling try just pressing down in the coil pack connector to verify it’s really making solid contact with the coil. If idle gets better you probably found the issue.