Hi. Car is a W123 body 1982 Euro version 200 with a 2.0 gasoline engine.
It seems I am only occaisionally having a strange issue where I am driving at highway speeds and out of nowhere the engine starts to lose power having to downshift to 3rd just to get back to 35-40mph. I just had the carb and fuel pump cleaned and 90% of the time the car runs with full power and smoothly. The coincidence or not is when this happens the last 3 times I stop the car for a few minutes and when I get going again my brake pedal gets softer than normal. (After driving just a short distance the pedal goes back to normal) The braking issue only happened when the accelration issue happens. I am not losing brake fluid and 99% of the time my brakes are normal. All I can think is this might be an electrical issue if that's possible on an old W123.
Any suggestions or fixes are very welcome.

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