I also had a problem with a 300ce that when you open the throttle all the way fast like if you where trying to pass someone, the car would almost die on the spot. but when you opened the throttle slow it would bogg and stutter. it was the ignition coil. I spent all day when I finally called Benzmac and he told me on the spot what it was. But also check your fuel delivery because my father also had a car (560 sel) that did the same). so I would take a fuel guage and check the fuel pressure as you drive the car. Remember have a person who's done this job before do it for safety.