The fuel filter is about 2 years old. Doesn't matter what level. It will do it at full, half, 1/4 doesn't matter.
When my cat went out, that was due to the egr vac lines were backwards after I had the head off for exhaust stud replacements, but I have not touched it since I fixed that about a year ago.
I guess I could wire in my o2 guage and see what the computer is seeing.


Got torque?
'02 Ford F-350 STD Cab V10 6sp 4x4
12MPG in town and 15-17 on the highway.