1998 Ford F150 Triton V8 with P0171 and P0174 lean codes that has had every part thrown at it and even the repair shop can't figure it out...
But maybe a DIY can.
See my website and download the Free DIY Diagnostics Book (during limited time only) at www.schrodingersboxqm.com!!

Part 2 is Here:    • Every engine part changed, still has ...