Cool Engine Surge!!!

[shoe]

Ok here is the symptom. At about 60 to 65 degrees C and at around 55MPH the car starts surging, not a miss but a pretty severe surge. I cannot tell if there is any black or white smoke as it has been dark when we first run the car in the morning. Now here is what I jut did to the car, pulled the intake and cleaned the runners, freed up the flappers and replaced both engine coolant temp sensors. I also performed PM service, oil and filter, fuel prefilter as well. Oh by the way this is on the 96 E300D any help would be great MBDOC, Benzmac anyone! This has me wondering what I could have done while I had the intake off.