Kompressor Problem solved.
Car now running ok.Looked on YouTube and followed an instruction to turn key to just before ignition and to hold accelerator peddle down for 2 minutes etc. Seems it has worked!! ECU reset obviously needed.
1998 W202 C230 Kompressor ..the Kompressor is not coming on when I accelerate hard and will not rev over 4200. It shudders at this and power fades. I then have to slowly accelerate and it`s fine driving in normal mode. The compressor has always been a bit jerky at it`s start but worked...