Golf TDI90: Rough Idle, AHU Engine Troubleshooting

Hello!

Can someone give me some tips for this problem?
The engine is running roughly at idle, with a slight hesitation.
The error memory is empty!
'While driving, there are absolutely no problems; the performance is okay, and there's no hesitation or jerking.'


Thank you for the tips.
Sure, here is the translation of the text from German to English:

'mfg' is an abbreviation for 'mit freundlichen Grüßen', which means 'best regards' or 'sincerely'.

Here is the translation of the text:

'Best regards' or 'Sincerely'
Sure.

Hello,

"Please read out the values from the idle speed control system (measurement block 13 in the engine control unit)."

Hello!

Yes, I can read those values. Can you tell me what I should be looking for, or which values are correct?

'Thank you.'

Best regards,
Sure.