Hello together, I wanted to pick up my Chevy today from the workshop, there was new Tüv and also a new Lambda probe had to be put in and a pair welded. The following problem. When I started it much to me not yet, only where I drove at a traffic light, then I noticed that he was just before drinking. When approaching he had then set himself up again but not on all cylinders, the Check Enginge lamp has lighted from time to time, I then to the factory stat t Back Tuckered and asked what had been done? we had only changed the lambda, we then fished the old one out of the garbage and thought that it could come from it, but this was unsuccessful, the distributor with finger I had then dismantled and seen that this was already finished, I then installed a new including finger, but the problem was still present. Now we are guessless, could it be that the Tüvprüfer has shot at the exhaust gas test any sensor ́ `? or is there any problem that occurs frequently?. What I should possibly say about it is that if the speed is higher all cylinders are running with vehicle: 5.0L 190 thousand Miles Bj 1991 I am grateful for any advice.