Mainly in bad weather, the engine sometimes runs rough.Zündspulen and candles were renewed, that was not the case.Werkstatt means maybe injection nozzle.Cars are not driven much. Who knows better? Sometimes it runs normal again when you give a few times a lot of gas. This problem occurred two years ago after the engine was lowered for the third time to renew Simmering to the gearbox because of leaks.