Thanks for the info. Will it immedialty restart, or does it need a cooldown period?
Have you been able to verify loss of spark (spark tester) or injection pulse (noid lamp) just shortly before it stalls?
When it does stall, does the Check Engine Lamp illuminate, as it should when the key is first turned On?
Do you know any history on the CMP (Camshaft) and CKP (Crankshaft) position sensors? These have an extermemly high failure rate, and often result in start and stalls or a no fire condition, at this milage it should have already been replaced at least once. Also, do you have access to a Vantage, or Lab Scope if it comes down to graphing the signals? On you Snap-On, does it show current CMP and CKP sync? If so monitor it just before the stall, if a second before one goes to "No," we'll know we're dealing with a possible faulty CKP. It's difficult to monitor sync on a condition which occurs so quickly, so this test may be inconclusive due to the slow transfer rate on the scan tool, but it may also show us an obvious sign.
Try spraying some Carburator cleaner into the intake, while an assistant fires it up, see if we can get it to momentarily run longer, verifying that this is fuel related.
Create a vacuum leak and see if it will idle than. Let me know the outcome of the tests and questions above, and we'll proceed from there. Thanks,