Our 850s is constantly jogging. That started about 3 years ago very slowly. Only occasionally he jerked out. Mistakes turned out: throttle valve poti disorder. I changed that -> no change. It creepingly became worse. Only when you drove on the highway at higher speed it hardly occurred. Finally, however, even if weaker. If I keep the gas constant (e.g. country road with 80-100 km/h) it goes down at the speed than when you take away gas. When I take gas away and wait for an eye view, I can give gas again normally (as if he has thought about it). When starting and changing gas in the e.g. city traffic, he jerks quite strongly. If I pull the plug of the throttle flap pot it runs much quieter, almost without jerking. I have already done this without having changed something: – throttle flap pot, that is already the third (bosch) – ignition cable replaced (bosch) – throttle flap removed, for a brew – new temperature sensor in the air filter – vacuum sensor changed – ignition coil changed (Bosch) – ignition parts/fingers (Bosch) – fuelilter changed – fuel relays (103), sometimes bridged – spark plugs I have already changed in the course of time – plugs removed from the Lambda probe (is still the first one), no change he jerks further – petrol pump is new about 15 years ago; one hears that it pumps (especially, If you bridge the relay) – Oil trap once about 5 years ago. Is there a vacuum hose on it? I don’t remember it any more. I thought I had found it. Crack in the rubber of the vacuum hose to the throttle flap. I changed and all the rubbers, the “locker” sat also. Pressure sensor removed, connections sprayed with WD 40. After that it was gone for some time, but now it came up again. Markus had the car before, with him this did not occur. He had the Stec ker des Poti with WD 40 flooded the battery for several days before. So slowly I am stuck with my Latin at the end. Does anyone have another idea? ECU? I had the error memory once “deleted” by holding together the two battery cables. Shouldn’t one do so. Cable break on the plug of the Poti?; can one buy a new plug somewhere? Can one remove the plug box of the control unit without causing major damage?