hi, my b4 1,9tdi 1z 90ps is jerking, but I have to describe this in more detail: he is jerking at speed (full gas), but only at certain speeds, he is jerking uphill, so somehow depending on the load. if I walk from the gas and roll is jerking nothing. the engine has no breakers, no start problems, everything ok my opinion. the jerking is also different strong, zb jerking in the 5th gear from about 120 – 140km/h he is jerking strongly, with 145 he is jerking little to even no. that’s also the case in other courses – unfortunately I don’t have a speedometer and can’t say at what turns the jerking occurs, but there seems to be a speed dependence, because this jerking always occurs at the same speeds, at some speeds he doesn’t jerk at all. but it still jerks even if I hit down at 120kmh from the 5th to the 4th gear. I read a bit in the forum and trip over quantities and n adelhubgeber as a well-known problem of this motor for jerking. a mechanic meant it could be the drive shaft or the transmission, the mechanic did not think of the quantity setting. now I need answer: 1. how does jerking by defective the drive shafts make itself felt? 2. how does drive shafts differ from jerking by a dirty quantity setting? 3. how does gearboxes make jerking noticeable 4. how can I just get out of where the jerking lies? 5. it is also written a lot that you can eliminate by “clamping the speedometer signal from the motor control unit” some jerking. how do I clamp what from ? if it is no longer jerking by disconnecting this signal, it is then due to quantity interlocking ? many thanks for your help, christian