1200 RPMs, at this point begins vibration and noise?

Hi Mr. Ken.
The turbo is working, it gives pressured air in the outlet.
There is a video for the dashboard and for the shaking engine with knocking.

The turbo is working, it gives pressurized air at the outlet. Please find here a video showing the dashboard and the shaking engine where you can hear the knocking.
Maybe there is an injector which does not receive orders from the PCM. In this case, please tell me how to repair it.
Thank you very much.

Thank you for your answer.
Yes the engine is completely rebuild, the flywheel is tightened according to gm indications.
Before considering the feul pressure weakness, I must indicate that the injector number 2 is not receiving electric signal ( I've seen this after the video).
However, the feul pump was not renewed, the hp pump is not renewed after 130000 miles, but verified good.
The feul pressure regulator is new.

Hi mr. Ken. Thank for the answer. About the hp pump tested recently, it was good. For the injector number 2 the DTC is P0202. After I have tested the wires I found 0, 30 volt which it seemed to me abnormal. For the second wire I found 7 volt, which also seemed far away from 12 volt. Beside this, I think that the fuel pump is weak. Because the rpm at idle is 7.5. Thank you very much mr. Ken.