Hello guys, First time on here! I bought a C220D Automatic 2013 from the dealer last year. I noticed that when the car is in park and I rev.. I hear an unusual noise just as the engine starts to 'move' and as soon as it 'stops'. There is no unusual noise when the engine is running and when driving I haven't noticed anything unusual. I have however noticed that when I accelerate quickly then brake, the car drops down the gears uneasily (I can feel the gear changes). It doesn't happen if I break normally. I have had this ever since I got the car from the dealer so I assumed this is normal, but I think it's been happening more often in the last few days. A little bit worried that it may cost an arm and a leg to fix!