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The "jump jump while slowing down" sounds like a sticky solenoid for TIC (torque converter clutch). The TCC connects the engine directly to the automatic transmission (then to the drive wheels). This way the torque converter is bypassed so fuel efficiency is better. TCC should only engage above certain speed, say 35 mph, and disengage automatically at lower speed. If the vehicle speed is too slow this direct connection will stop the engine (just like in manual transmission).
I am not sure if Mercedes ever uses TCC. I suspect they don't since I don't recall any wire going in the front of transmission box. There is kick-down solenoid but it is at rear. Also, you did not mention your vehicle maker, model and year so the above information may not apply at all.
I don't think bad bearing will cause the problem you describe. Bearing problem does not go away because of speed. In fact, higher speed should make bearing worse. I would take the car to somewhere else.
denourse wrote:
I'm thinking engine /transmission mounts, drive shaft support or flex disk.
It is too hard to say what is wrong with your car if you don't mention what model and year you have.
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