Hello! Be careful, long story! The day before yesterday my Hirsch control unit was installed in my 9-5 2,3t ecoturbo BJ ́99, I have various problems. Since the installation the engine jerked quite violently in the low-touring area when accelerating from approx. 1500u/min upwards to almost 2500, then it ran round. In the case of engine brake or gas removal at approx. 2000u/min he also bucked. Today my dealer then tapped on the spark plugs exchanged only last week and replaced them, as well as the the pressure of the fuel supply increased from 3 to 3,2 bar. This helped a little against the jerking, but now it often takes me to the traffic lights when I brake and steer at the same time. In addition, it goes up shortly after the start up with the speed, in order to then rapidly suck off and go out. If then after several attempts you just get gas, it catches itself then at some point and runs also round. The engine fits exactly to the control unit, that has a call at Hirsch in the Schwei z. The intake pipe was also exchanged for that of the aero and the air filter is a new K&N. So air shortage can’t be. The mechanic now suspects that the control unit lacks the control signal from the 2nd Lambda probe, which was installed additionally behind the cat from MJ2000. Does anyone have any idea what that could be? Thanks in advance!