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From what you describe, it sounds like the engine runs only on the CSI (cold start injector) which stops injecting once the Thermo/Time switch shuts it down.
Check that the fuel filter is nor restricting flow.
Other checks: fuel pumps, fuel pressure regulator (at end of the fuel rail).
The Fuel Injector ECU, not operating, because of bad ground(s) or blown fuse. Also check the Drive (tachymetric) relay under the rear shelf next to the FI ECU, that is the one that senses the coil operation and tells the FI ECU to inject.
If the ECU can't supply a ground, the injectors will not be able to inject.
Also see GHNL's signature page and link to his excellent Bosch L Jet diagnostics page.
TTFN Elio
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