Hi i have a Merc CLK 200 Elelgance Auto and i keep losing power. The best way i can decribe the problem is like when you drive a Manual car and you take your foot off the clutch and low speed it starts to shake and is about to stall well that is happing on my car its a automatic i do not know what it is. When it happens the engine starts to shake and wont go over 2000rpm, but with i turn the car off and start back up again it will go normal for a while before happening again. Please help.