96 f250 P0171&P0174 need help passes all vac test
Check mass air flow sensor ...as well possible ecm may need update ...
Mac passed mode 6 test how about a restriction like low flow injector but that shouldn't give me a lean condition in both banks a weak fuel psi regulator I'm leaning too
Sorry meant maf not mac
Those codes are classic lean codes, Unmetered air is being detected after the MAF. You said you did a vac test? I d perform a smoke test. Might be a small hose or gasket.
Looking for a Used F-250 Super Duty in your area?
CarGurus has 42,987 nationwide F-250 Super Duty listings starting at $2,250.
Search Ford F-250 Super Duty Questions
Ford F-250 Super Duty Experts