96 7.4l SFI fuel pressure???

[BMKAR]

Any one know what the fuel pressure AT IDLE is for a 96 7.4 SFI...?

I have the fact. manual and found pressure spec of 56-60psi w/ key=on

and engine=off... then,(when running) my pressure goes to 50-52 at warm idle...

IS this 'way' ok  or marginal???

    I'm trying to find a reason for this "stumbling" 80k mile Suburban...

It starts quick and stumbles, cold or warm, no CE light, no engine miss recorded

on Autotap...BUT... pending codes showed P0153 and P0161... all 4 oxy sensors

show variation on monitoring???

  Had an independent GM trained mech put a fuel pump in less than a year ago...

hopefully won't have to go that direction again.

 

Regards,

BMKAR