Vortec 4.3 v6 start and stops

[AGUILA-UNO]

I have a Vortec V6 start a few seconds and stop. I changed the TPS, checked the oil sensors, cleaned the inyectores. There is a good fuel pressure.
Please,I'll appreciate any help

 

[AllDodge]

Serial number of the motor?

What is the fuel pressure your seeing?