N62 Idle slows down shortly after stopping.

Moin Freunde, I’ve been looking for the cause of the following errors for a long time. Unfortunately, I didn’t find any helpful answers. If I stop at a traffic light, for example, then the speed is short under 500 u/m and then catches again. That’s very annoying and I wonder what it can be. I’ve already changed the kge membranes and the hose of the kge. The oil cover is slightly sucked in by the engine which is also right. The ignition candles are new and saw All well done. The ignition coils are all well measured. I cleaned the magnet valves since the empty run is quieter. But it still settles down after the stop. Do you know what it can be? Does the engine have something like an empty run or something like that?