Fuel pressure regulator?

[God]

I have had a hard start for as long as I've owned my yukon so I always prime my engine by turning the key to the on position for a couple seconds to build fuel pressure.. Anyways I think it may be time to
change the fuel pressure regulator as I think it may be what is causing random stalls when the rpm is near idle.

How do I change the FPR, and where is it? Some research suggests I
Switch out the entire spider assembly for a "newer" design but I think mine works fine.

 

[SunlitComet]

the regulator is mounted on the fuel body inside the intake system. but if you have the old injector body just change it. it will come with a new regulator attached. delco or delphi only.