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This is a tough one I think. I think it unlikely to be the head gasket, or fuel pump, O2 sensor maybe. But if the O2 sensor I would think it would occur whether you stopped or not.
I'd guess the engine is flooding when you stop the second time. Perhaps a leaky injector dumps fuel in during the stop, and it is too rich upon restart.
Only other mechanism may be a faulty engine temperature sensor, which is open or reads too high and is making the ECU run too rich.
How is your gas mileage?
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744 & 745 16v 4+OD, 245 SE auto, 242Ti 4+OD, 245DL auto parts car
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