I don’t know any more!! Engine hardly/no power!!

Moin municipality, I am at the end with my Latin: I have already done the following: air filter/diesel filter changed, while looking immediately for chips, everything OK. injectors checked, injector cable tree renewed, everything OK. motor cable tree checked and measured, everything OK. (It was mainly about the wire harness from the LMM) turbocharger rods checked for consistency everything OK, while simultaneously all vacuum hoses renewed, everything OK. I have no error codes in the error memory and also The live data doesn’t say anything about what’s broken or in trouble. Even throttle flap etc. works perfectly. (according to live data) What I’m going to do is check the control times because the previous owner of the timing belts was allegedly changed. May be that it has moved by 1 tooth. My problem is that he has no performance and he takes a very long time until he is even at speed. Feels like he runs (if it were a gasoline) on 3 pots. I had read a thread in the forum that it might also be the Rail pressure sensor that spins. But don’t find the threat again. The Kia workshop (The screwdriver) meant it wasn’t. He would hear that… But didn’t have it on the device. I have to believe it that way. Then I had read that an update of the software for the motor control unit should do something. But I’m not sure if it is going to work. for Carni. I’ve definitely been through with my Latin and would look forward to more tips before I have to get a butcher and replace the engine completely….