2007 Lincoln Navigator 5.4 3v 96k miles, threw code p2272, I put smoke test, found crack in oil dipstick tube and snorkel/reasonator was not seated correctly on bottom of intake both fixed and also discovered hose from manifold to vapor solenoid was cracked and I replaced that too thinking it would solve my problems, no dice. I changed fuel pump in January 2024 with new fuel filter both after market. Fuel pressure test 58 psi with gauge, solid on idle and WOT might dip every so slightly for a brief moment but nothing obvious. Changed MAF with good known sensor still lean. My LTFT at hot idle +6% bank 1 and +8% bank 2 . If I give any amount of throttle those numbers jump immediately to double that +14% and +16% cruising speed around +17% both banks. WOT no change numbers stay positive. STFT vacillate between -3% to +3% at idle. Upstream Oxygen sensors switching, down stream not so much. No misfires, no codes, no driveability issues, I've used Torque Pro and Forscan, only thing that seems off is baro reading goes to 15.1 psi, I'm at sea level in Houston, Texas my other cars with same engine have baro at 14.4. I reset KAM multiple times, defaults to 13.2 psi then slowly climbs back to 15.1 psi which I find odd. I thought maybe poor ground to MAF sensor but used jumper wire to ground, still does the same thing. The ground wire to fuel pump was on rusty frame, I cut the wire and STFT skyrocketed lean, I put new connector and cleaned frame, still same. I'm super stumped, this vehicle doesn't have that fuel pump drive module on frame. Any ideas or suggestions welcomed please. I'm out of ideas. Should also mention MAF reads 5-6 g/s at hot idle. Vehicle has all new OEM plugs, HV oil pump, guides/tensioners etc, cam phasers...
