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try this ?= renew the throttle fly by wire control inside the the car ,they go just like the way you describe ,car runs then just stops ,leave and it goes again ,trust me been their got the teashirt on this one ,some customer paid out over 2000 euros to a renault garage for the same fault and it was still the same till a little bird told me what to change ,with one from the scrappers it been ok ever since
I had the same fault on my laguna remove idle air valve and clean with carb cleaner
then lightly oil with light oil like 3in1 DO NOT use WD40 as it goes sticky when the
solvents dry out replace valve and check connections