Hey my partners car is a vs wagon and when engine cold when pit in drive it just sits and does,nt move unless touch accelerator. My car vs berlina and does,nt have prob.
Usually that is an indication of a transmission that has worn clutches etc unfortunately. If you want to delay having to spend a lot of money it might pay to get the transmission serviced which may give it a few more thousand Ks of life. It may just be a clogged/dirty filter so once again get it serviced. If you are handy you can do the service yourself and save many $$$$.
I would also check the colour of the transmission fluid - it should be bright red....if its brown and has a burnt smell then it's Overdue for a service.
Good Luck.
Next step is to throw in a can of 'auto trans fix'....there are different brands in all auto shops - this usually will make the clutches/bands grip better so that it delays the time for replacement.
Good Luck.