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Had a similar problem in two different cars. I was doign a compression test or a leak-down test or something and a vacuum line got disconnected near the throttle body. Car would start up and raise to about 3k rpm (thats normal) and drop back down to idle , then die. Traced it down to a little black tube.
The other one was airflow related. Had some gunk on the butterfly valve for the intake on the trottle body. When idling, the gunk closed off almost all airflow and it stalled out. Cleaned the valve, took out the throttle body, did some work on the TPS and a good cleaning and it runs great.
Could be air, fuel, or vacuum lines. Check your airflow, intake and trottle body. Look for unplugged vacuum lines. Check the fuel pressure in the rail, when its primed and pressurized and when its running. Any of these will limit it down to the general area that is causing the problem, then you can go from there.
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