1992 454 TBI Fuel Pressure HELP

[De-stroker]

yes. when i climb a hill the exhaust manifolds start to glow within 30 seconds. we cup the tbi shut restricting air flow in and the glow goes away so it's been confirmed that I have
a fuel delivery issue. no exhaust blockage, new catalytic. timing is good, engine has been rebuilt in fact with timing chain and new exhaust manifolds. no vacuum leaks and i put in a new
fuel pump, a new pump relay and the fuel pressure regulator has been rebuilt also. I am seriously amazed why this is happening but it cranks over right away good power. Even the computer
has been replaced.

my thermostat was upside down ran hot when I pulled up one hills in flagstaff till the fan started pumping I could bet on it staying in open closed loop check your vacuum at idle and timing I swear my vac was like 30-40 in so I put a lot in it oh it was hot could cook dinner at idle