Re: "MYSTERY" vacuum line on 3.o flex
Trace the vacuum line back from the EGR valve to the EGR Vacuum Regulator (EVR)solenoid valve. The EVR should have two vac lines connected. One of them goes to the EGR (as mentioned above) and the other to the intake manifold.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid