DPFE doesn't use vacuum hoses.
DPFE will have 2 hoses but they are exhaust hoses, one close to EGR valve, one farther away from EGR valve on the exhaust manifold.
The DPFE sensor reports the pressure difference between the 2 hoses to the computer.
If EGR valve is open the hose closest to the EGR valve will have lower pressure than the one farther away, the bigger the difference the more the EGR valve is open.
But you don't have one of those on the 2.3l Duratec
It uses a stepper motor, like the IAC valve does.
EGR valve and stepper motor are one unit, so are replaced as an assembly.
Computer sends a "step" command to motor and EGR valve opens 05 degrees, another step opens it 10 degrees, ect...
So check connector on EGR valve