How long does it run - a few seconds, a minute?
You've probably already checked, but does it keep fuel pressure after it starts? Is it keeping consistent spark as it lights?
Another thing which can do this is having the base fuel map way off - if it is way rich or lean (usually rich) the engine will die as it transitions from startup fueling. Just go in and decrease the whole map by like 40% and see what happens, and try increasing instead if that doesn't work.
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