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Could be as soon as it warms up and goes into closed loop, a sensor or solenoid is enough out of whack to cause it to stall but not enough to trigger a check engine light. If this is the case if you had to you could force a check engine light on by unplugging something like an o2 sensor. You really need to have a scanner with live data to watch and see what's out of range. If you don't have that I'd swap the old parts back on and see what happens.
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