1993 90CS - Simple goes dead when slowing down ..

3 times now my car has just died. The engine just stops. All 3 times I was slowing down to 5-15mph to take a turn.
I did just add MOA oil and BG44K gas treaments.
I also cleaned out my mass airflow sensor by spraying it with 90% ethynol.
Any ideas?
Thanks
Erik
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Does it idle without stalling for any period of time after warming? I've had trouble with the Idle Stablizer valve causing this behavior.
Gene

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It idles without stalling
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