Thanks ...

I also realized another possibility ... it dawned on me today as I looked at the throttle linkage that I had very thoroughly vacuumed the inside of the car about 20 minutes before the incident ... including ramming around behind the accelerator pedal. I suppose it would be possible that I kind of jammed up something right behind that pedal in the process, and it corrected itself. Won't hurt to lube as much up as I can anyway.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)