1993 Mercedes Benz 300e hesitates or very low power

In seemingly random situations my car will lose power as I go to speed up. This happens regardless of the weather temperature or how long the car has run but does not happen at startup or when first driving. It is most obvious when accelerating onto the freeway and the car will not speed up at all, but it does not die. Releasing and reapplying the throttle will sometimes help.

Most of the time the car runs fine with no symptoms and can go for weeks and long distances, 100 miles or more, with no problems.