do you use both feet being an auto ? If you hold the car with your left foot then hit the gas with the right there will be a big delay ! or are you talking about the 3-5 sec delay when you first select gear ? try doing a rapid 3 point turn in a Merc and its near suicidal ! as the can takes a while to repsond when changing from R-D or N-D.

They do suffere with sticking EGR valves and laeking intercooler hoses on the 220s