Low fuel pressure lean fuel code 171

99 GTP miles 130000

runs rough most of time, code occurs just about everytime it is driven.

have replaced fuel pump, fuel filter, vaccum harness, fuel pressure regulator.

I have been thinking about getting an adjustable pressure regulator and just pump it up.


fuel pressure is at about 40 psi should be 55.


Possiblities -

other component on the vaccum harness leaking.