help me

Sorry to bother you I'm sure you've been asked before but please can you help...... I've had my cls 55 amg for about 2 months and I love it but when I drive it hard (which isn't very often) the power goes... the revs stay the same and it still sounds like I'm going fast but it's not...

Hello. I have just purchased a merc c220 cdi. It has a auto box but also can use it as a semi auto, i drove the car back home and parked it up. A few weeks later went to move it, it started fine but wouldnt select a gear. It just poped up on the dash "select gear" but wont go out of...