Error 575 Suction tube pressure Control difference in the TDI 1Z

Hi, who knows? A weekend will win at your home as a price, replacing a price for conducting peace negotiations in a crisis area of your choice! So: Sporadic error (according to error memory). What can this be most likely? The car runs in the green area. Say: Normal consumption, Vmax ~190Kmh-1 + x depending on weather conditions. Quiet idle and starts well. The only problem He is jerking. In the partial load area it is particularly bad (not so bad anymore (60% better) se The general descriptions of the possibilities of eradicating this error are known to me. But where exactly do you use the lever now? TDI, 1Z, 371,000 Km. klaus