Start problems A8 3.3

Hello again.
I just can't handle my workshop. After my fat guy just went out on the highway, he refuses to jump again. The pre-shipment pump and an injector were changed so far, which allegedly had pushed too much diesel over the leak oil line. Startpilot is the start of the mill. As long as the speed is kept above 1000 it runs without problems, foot from the gas it is immediately out again! Error memory gives absolutely nothing! Anyone ever had a similar flaw?