Going from memory on my daughter's 92 400e with the same problems and mileage you have. M/B dealer had car for extensive time and couldnt find problem. I changed brake pedal switch...that not it...there is also a transmission switch...not mess with it. Was told any slight electrical thing like lightbulb out somewhere could trigger the ASR .

Turned out to be comination of a few vacuum leaks as engine compartment gets hot and causes deterioration of all rubber stuff in there AND the throttle control device. Very expensive at $750 and several hrs labor. Cannot rebuilt them but there is an outfit from Florida as I recall who does sell rebuilt units.

Once you replace this device, car will run perfectly and cruise will work.