I have a C200, automatic, which - together with some bad advice - has been giving me an increasing deal of trouble in the last three week. The problem, in a nutshell, is this: The engine is vibrating excessively, particularly when moving in slow traffic (for instance, when stopped at a traffic light, in Drive mode). It feels like one of those old diesel vehicles now. More worryingly, when moving at slow speed, there is a lack of power (not enough pickup). It feels like the engine is not quite catching and you are moving along in the fourth gear or something. A garage guy I took this to diagonised it as a gearbox problem and I ended up changing the gearbox for a refurbished one (I am cutting a long story short here - I had some bad advice on the way). If anything, the problem became only worse after the refurbished gearbox was put in this morning. I took it for a full service - air filter, fuel filter, oil change and spark plug clean - and just got the car back. The problem is still there. Any suggestions? Have spend a lot of money on this. Is it better to get rid of the car? Or is this something that is fixable?