Mazda Diesel: Low Power Models

Okay, just to wrap up my previous threads.
On Thursday, I picked up my Mazda 626 diesel (with an engine power of 81 kW) from the workshop after it had been there for 9 days.
Problem: Low power and torque.
Various components have been replaced over time, including the lambda oxygen sensor (LMM), the exhaust gas temperature gauge (Gassensitometer), and most recently, the air intake temperature sensor.
A slight vibration could still be felt at 2000 RPM.
I also added two cans of Liquimol to the tank myself.
And after countless trips to the workshop, the car now runs like new again...
No more problems with sluggish acceleration and no more jerking.
Okay, a long four-month journey has come to an end...
Conclusion: When replacing electronic components, workshops often do so blindly, and this can lead to negative consequences due to error memory issues.
The good thing is that everything was covered by the warranty, so at least it didn't cost me anything.
Greetings to everyone who has experienced similar problems; sometimes the issue can be caused by a combination of many different factors.
Hello.
Rob's