I also have a 2000 STS that periodicly will not start & sometimes will stall on slow down for a turn. It does not pull any codes. The only thing that is not right is, I do get the " SECURITY " LIGHT coming on, with no codes.
Wrong forum, try the Seville/Eldo forum. This is for 05+ STS's.
But, I had a 01 Seville with the same issue. Turned out to be the crankshaft position sensors.
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