FilterDienste

Can anyone help, I am having a problem with my c280's tranny. It is struggling when engaged in "D" until I rev up to 2000+rpm, then start to move slowly until it picks up. At this point it changes all gears correctly until it comes to a stop then it begins the same thing (it does't do in reverse). would this have anything to do with the clutches or the torque convertor? I have changed the oil and the filter - since it was black in coluor.