TDCI ruckelt manchmal bei Volllastbeschl.

Hello,

How about reading the error codes?

Chip specifications? More power/torque?

Could the clutch be slipping?

It could also be due to the chip!

coupling is definitely good

It has nothing to do with being good or bad; it might simply not be powerful enough to handle the torque.

What is the original torque output of the engine?

Hi,

ruckelt es nur einmal, oder immer wieder kurz nacheinander, so, als ob der Motor Aussetzer hätte? What is the speed?
Check the fuel supply!

Regards,
Sure, here is the translation of the text from German to English:

'Micha'

Hi id&t,

How many kilometers has the diesel filter been in use?

Best regards, Rainer.

@id&t: I kind of recognize the problem. Back then, it was a diesel supply issue. Possible causes for you: diesel filter, fuel pump (if you have one, you have a common rail, if I'm interpreting 'TDCI' correctly), or some kind of leak.

Regards,
Sure, here is the translation of the text from German to English:

'Micha'

Hi,

There are probably many possible explanations: for example, a vacuum might be forming somewhere that dissipates when you release the gas pedal; something might be stuck in the line and change its position when you release the gas pedal, etc. But: all of this is speculation. I would check the fuel supply and eliminate any anomalies.
If the problem still persists at that point, then we can consider further options.

Regards,
Sure, here is the translation of the text from German to English:

'Micha'