i slowed my car once by shifting down gear manually and up really quick that made the car to jerk all the sudden and stop in the middle of the road when i just got my car, and rit now my car sometimes vibrates in the morning when i put on reverse or park and it has a ticking sound when the engine is on.... is this related?

 

You should probably just get the dealer to look at this stuff, since it seems kind of abnormal. It might not hurt to neglect mentioning the downshifting stuff? I don't know if they'd consider that abnormal use or anything? ??

Anyhow, please get it looked at by some reputable MB techs.

... NOOOOOO, not the Ticking Engine!!! here we go again ...