Replace the DPFE sensor and hoses, this is a very common concern.
The Exhaust Gas Recirculation (EGR) system controls the Oxides Of Nitrogen (NOx) emissions. Small amounts of exhaust gases are recirculated back into the combustion chamber to mix with the air/fuel charge. The combustion chamber temperature is reduced, lowering NOx emissions.Differential Pressure Feedback EGR System The Differential Pressure Feedback EGR system consists of a differential pressure , EGR vacuum regulator solenoid, EGR valve, orifice tube assembly, Powertrain Control Module (PCM) and connecting wires and vacuum hoses. Operation of the system is as follows (Figure 86):
So is is fairly safe to say this is not a vacuum leak but a problem with the DPFE sensor and is the moister I found in sensor the key along with rough idle