Mercedes-Benz S430 Questions

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My 2006 S430 MBZ has only 50 k miles and over all is in excellent shape.
What can cause no power it ran good when I bought it I then it started running rough have to stop turn it off then try to drive again I changed the spark plugs and coils it still has no power and it stalls when I push down on the gas what can this be
Car would not start without being jumped. Thought is was the battery so replaced it. Still have the problem if car is not started every day and driven. Something is draining the battery obviously. Has anyone had this experience or have any suggestions as to what the problem could be?
no interior cabin heat
car has a shake when pulling away cold. shifts into second with a slip. car has slight shake until it warms up then runs well. Even when warm and you rev engine you fee a shake. New plugs, mass flow sensor and new coolant temp sensor
When I am driving it is fine but when I turn the car off an hour later the rear of the vehicle raises about 3-4 inches.
deflating like if you have a flat, now my rear passenger wheel is very low, only on one side, please tell me what it could be, thanks in advance
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