W211 Lack of power & jerking when pulling away

[Contrast]

Hi everyone i'm new to these forums, so first of all hello to everyone.
I've got a W211 320 cdi sport estate, and have a problem that's driving me crazy.... sometimes when i pull away i get a complete lack of power and the car jerks violently, as soon as i take my foot off the accelerator and put it back on it's ok, although sometimes it goes into limp home mode, so i turn the ignition off and restart it and the cars ok.....
I've taken it to a MB specialist and had a new Throttle actuator assembly, Turbo pressure sensor, gearbox oil and filter changed, fuel filter and the cat cleaned, and guess what? it still does it....
Any help would be great as this is a fantastic car, but i'm loosing the will to live.....lol

 

[BlackC55]

It is very likely to be a back pressure sensor and/or dirty air filters. When the sensor is replaced the adaption data needs to be re-set.

 

[Contrast]

Thanks Ollie, i'll give that a try.

 

[brucemillar]

FYI: Ollie's adaption re-set is a great call. I had this on my C240 which showed no errors on STAR. Same symptoms (apart from the limp home). A re-set of the adaption values on STAR and the car is now A1.

 

[Contrast]

Thanks for all your help, it's really appreciated.