Default Major mystery TBI idle then cuts out.I have a 1991P30 chassis 454 TBI. After 4 1/2 to 5 1/2 minutes after start from idle the injectors stop dead. At this point key still on, try to crank and no fuel as viewed in tbi or start. Dynamic fuel pressure is 13 to 14 psi constant. Fuel is clean and filter new and new gas. Because of age of unit the following were replaced: ign control in dist., new dist. with cap and rotor (retimed per procedure), new plug wires, tbi rebuilt with ac delco injectors and gasket kit with new regulator diaphram, iac new (idle adjusted to 700 rpm with iac disconnected per procedure), temp sensor in front of block, thermostat (190).

ECM opened to visual for burned components or burnt smell, A ok. Start and run with foot on accelerator to hold 1500 rpm and continues with injectors producing perfect cone shape at 10 minutes plus.
Key off, wait 15 secojnds and restarts then stumbles from idle and cuts out after 2 minutes. NEED help please?

 

did you ever figure this out?