00 Cranks ok hard start cold

I have 59 psi on the fuel pump when cranking then 50 when running. But runs bad for the first 1/2 mile then fine after that. New a/c plugs, wires, and fuel filter. No codes. Acts like lean. Had new FPR and PUMP a couple years ago. No fuel leaking by the vacuum port on the FPR. Is this another bad Fuel Pressure Regulator? 100k 5.3 4x4

60-65 is really the right pressure here.

The FPR you bought. is it OEM or Aftermarket? if it is after market it maybe why you are having issues.

FPR was changed two years ago under warranty. I put only AC Delco parts on this.

Check the value the temp sensor is reporting to the PCM. Another possiblity is a small leak at the intake manifold gasket. Leak goes away after it expands slightly.

Sounds more like a bad temp sensor to me.

//2000CAYukon

Are these common for intake problems?

New FPR from delco no difference. Spec according to dealer is 55-60 and I have that and it does not bleed donwn and it does not take but a second to build pressure.

Anyone?