Had a water pipe go about 3 weeks ago so whether it has anything to do with my currant problem of the car missing as if a spark plug breaking down and also making a waloing sound at low revs under preasure main dearler said it was the battery but its still doing it , they also think it may be the torque convertor but they said sometimes the water pump and radiator might be leaking into the gearbox causing similar effects as the torque convertor , bit confused can anybody help ,

 

Odds of tranny fluid glycol contamination high if you have 2003 model year.

 

+1 on glycol contamination

 

Check if you have a Valeo radiator, they were infamous for that problem. I believe Mercedes switched away from them late 2003/early 2004.