i had this exact same problem on my teg a couple summers ago. the car drove perfectly otherwise, but as soon as i came to a stop, the idle would intermittently drop too low and make the car cut off. it would start right back up after.
in my case it turned out to be an issue with my map sensor. i had a 3bar in at the time and both the 3bar and the stock map sensor were plugged in. the car was originally tuned like that so luckily it didn't cause any motor damage. i'm only running off the wastegate (10.5lb spring) so I just retuned the car on the stock map sensor and haven't had an issue since.
check out your map sensor if you haven't already. good luck.
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