5.7 hemi rough idle and low backfire out exhaust any ideas

brian6pac i thought that might be the issue but i dont find any fuel in the vacuum hose i am using the corvette regulator and it is not adjustable i changed both o2 sensors and it seemed to solve the problem but it has happened once before so i am thinking you are correct do yo have any idea where i could locate an adjustable fuel pressure regulator what brand and such