I have this happen too me in every new edge now that I have an air/fuel gauge I saw what happened when my car shut off randomly slowing down, I stopped getting fuel my a/f went up about 18.0 and my car died. Most the time especially if you have idle surges I notice the my car doesn't get much fuel after maybe pulling it out of a gear and slowing down. Usually it will get to 16.0 but if it goes any lower it just chokes and dies, I spray a wet 100 shot on my car my a/f is spot on, just a 2v thing, my buddies 06 f150 with a 2v has done this to.
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2004 Mustang GT 5 Speed
Full Bolt Ons
12.1 @ 117.9 (1.7) in 1/4th
7.6 @ 92.1 (1.6) in 1/8th