I have a 1995 E320 Cabriolet with 29,000 miles. It is in pristine condition. However on about 5 occasions after driving the car for 5-10 miles the car would not accelerate past 20 mph. The engine would "buck" for lack of a better term between 1500 and 2000 rpms. It would idle correctly up to 1500 rpms. Then it feels like it is only firing on 5 cylinders. No check engine light comes on. In four of these occasions it started while turning right at low speed in a parking lot or in my neighborhood.I found if I pulled over, turned off the engine and sat for 5-10 minutes it would start up and act like it never happened .It could then goes days without happening again.I have only put about 400 miles on it as the second owner.
I have had one of the ignition coils replaced after it malfunctioned. This symptom is similar but different as it corrects itself and no sulphur smell. I have had the spark plugs replaced.
Looking in the E-Class Bible I found a similar sympton that points to the "accelerator pedal position sensor". Any thoughts on this one?
Thank you in advance for any responses