If I had a very funny case here, I would have driven home from work just two weeks ago, and on the track, I had broken my middle silencer (through rusted) exactly at the same time, he had driven on 3 cylinders. From about 3000 revolutions the 4th cylinder also jumped again. Until home no problems. New middle silencer ordered and until then the pot urgently patched with a lot of exhaust kit. Two days he also did not have any problems. Then he did not want to jump any more. Then I dragged him to a buddy and installed the new middle silencer and also a new end pot. From the lifting platform down. Keys in and give him…. He orgs and wants to jump on but shortly before he is ready, it is as if someone was taking off the power or pulling off the ignition key again. He breaks into himself and starts from the front. Even if I tried him with foreign starters, even the same problem is still present. The spark plugs, the tooth seal, the spark cable are only half a year old. In the summer, I also did not have a cold run control system, but it could not be cleaned.