All the anti-Pollution devices have been long since removed. I'm wondering if the Warm-up Regulator might be intermittently drawing too much current. The wiring dwg appears to show the FPR Power comes from Alternator & Warmup Regulator. After it was near fully warm & had stalled, I unplugged the WUR. Car idled higher, but didn't stall idling in garage for ~5 min.

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts