Hello people, and I have been having the following problem for a long time: My 80s convertible 2.3 MKB: NG goes out during the ride. Meanwhile I can conjure up the problem exactly. And that is when I drive e.g. in the 5th gear and I switch down into the 4th gear (motor brake therefore without gas), let it come still rolling and is on. But now I couple again and insert the empty run and let the clutch go off then it goes out in the roll. The lights flash, the rev indicator is on 0. Now when I start it with the ignition key, it jumps again, but the error comes again every time. Only if I don’t hit it with the ignition key in this condition (so put a gear in under rolling and let it come by clutch) the problem is gone during the whole ride and it goes out in no more situation. Only the idle speed number is increased. I have now a 2nd 5 cylinder with me and have started to exchange various parts gradually. Unfortunately without success, but I don’t want to change parts of the valve, but I can’t know how to say that I’ve got a little bit of a hose.