MB 350 SL low power

good evening dear friends, my MB 350 SL loses power when I reach 4000-4500 rpm and does not increase. 
The engine has had major extraordinary maintenance, cylinders, pistons, MAP sensor, trigger point, ignition cables, ECU, distribution, and more.now,the engine has 11000 km.
only the injectors have not had any maintenance, but they appear to be in good condition.
what could be the problem?
whit the rotary button on the ECU i can increase the fuel?
thank you for your precious help and best regards.

Hi,

I would start with ignition first. Does ignition timing fit and do you have right components installed. Then it would be great if you could have a measurement of ignition signals to verify they are all there and in full power.

Then we would continue to search in D-Jetronic. ECU rheostat should not be active outside of idle.

Good evening Volker, the order of ignition seems correct to me, however I will try to make a new check.
This problem is old and manifested from the first start after extraordinary maintenance.The engine up to 4500 rpm works wonderfully.
Also I add the motor wiring is new.
Thank you for your help.

Hi,
you forgot to sign your posting with your first name...

In addition to what Volker wrote: You find the values to be verified here: www.startekinfo.com/service/download-doc.../M117_45/075-500.pdf
Check not only at idle, but at 1500 and 3000 rpm too...

There is a speed-limiter-finger in the distributor. This could be misadjusted or defective.

Regards
Norbert

edit: The ECU-knob is only for adjusting CO at idle. It is active only at idle.

Many thanks Norbert,
My name is Marco,
Greetings from Italy

Hello Norbert, I can not understand the detail of the speed limiter in the distributor.... is it related to the rotor?
Thank you