I went to the dyno tonight with Allen (thanks for the help Allen). The baseline #'s were OK for the little 4.8. BUT the wideband was reading 15.74. That's way lean!!!!! All Allen and I can come up with is the fuel pump, regulator or the injectors are bad..

I know the fuel pressure regulator is adjustable. Does anyone know how to adjust it???

I'm going to put a fuel press. gauge on it and that should tell me something.(I HOPE)

Has anyone else had this problem??

Allen fed as much fuel as he could with a tune and the motor ran the same??Between 14.85 and 15.72 A/F
So I know it's NOT THE TUNE, it's the truck....

Allen, thanks for ALL the help. Allen is a stand-up guy and is easy to work with.