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There is a solenoid that releases the shifter lever from park when the brake pedal is depressed. So it can be the solenoid or can be the brake pedal switch.
You can call your local MB dealer parts department and they will ask for your VIN#. You can get the switch/lock/tumblers and will work with existing keys.
I may ask a lot of questions but to shed some light on your issue. Does it stall Every time, all the time? or once or twice in a day? is there anything you can do to not to make it stall, like neutral or raising your rpm? once in a complete stop or when coming to a stop? check engine light on? any malfunction lights on>?
Have your suspension checked and wheel balance checked.
Sounds like going into a limp mode...are there any Check engine light or malfunction lights? Have you used OEM sensors?
Check your basics first. battery and charging system. Low charge or failing alternator can cause all sorts of weird symptoms.
Have it diagnosed by a reputable repair shop. Misfires can get costly with guessing game. Possible ignition problem, Scoping it should further shed some light on ignition faults. Check fuel system also, a failed injector cyl. 3 can be the cause. Or it can be mechanical, cylinder compression test and leakage test can be performed to check mechanical integrity.
If it is loosing charge, then there's got to be a leak somewhere. I would use a dye to detect leaks, also check drain tube of your evaporator while using a black light. Your leak might be inside the HVAC housing reason its hard to find, if leaking could mix up with water and drain out in the hvac drain tube. A reputable auto repair shop should get you on the right track.
Energy suspension bushings are a lot harder than your stock rubber bushings and does not absorb vibrations as well as the stock ones do. They are great to prevent movement but not so good with absorbing vibrations. We do quite a few of engine swaps on hondas and whenever we swap it for a bigger motor we use modified motor mounts which are a lot harder than stock. Vibrates like hell. :) Switch to stock mounts.
Check weather strip around the passenger door for cracks or cuts. Also on the passenger side under the glovev box look for any cracks on the plastic casing. check to see if there are any water leaks there. you may need to remove the kick panel to have a better view. I have seen cracks there before causing water leaks.