What is the fuel pressure spec for 1997 suburban 5.7 vortec. Cannot get rpm over 3K with 50lbs fuel pressure.

 

60-65psi, mines about 52 right now not sure the new style fuel injection spider i have on there is as sensetive to fuel pressure as the old poppet style ones,i'm not haveing any problem getting over 3k the only problem im having is hard starting after sitting over night i did the fuel pump no change so i'm going after the pressure regulator next