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we have replaced crank position sensor, ecm/ coil packs and computer. got good pressure on fuel rail.

starts cold, will run normally for approximately 5 minutes before it dies and will not start.

sometimes we can hold accelerator to floor and it will "hit" a few licks but promptly dies when accelerator is released.

we've checked fuses and relays; what are we missing?
 

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My 1988 Regal 2.8 did that. Finally I took off the plenum and checked ohms on fuel injectors. Specs say must be greater than 12 ohms. Two of mine on the front bank were 4 and 6 ohms. As I understand it, this much current on same bank overloads computer and shuts down. I changed all six fuel injectors. Car starts and runs. It was a fix.
 
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