1994-95 mustang gt vacuum

[Yellow94Gts]

Does anyone know what vacuum lines and where they would be routed behind the dash of my gt are? I’m being told that there’s some routed behind my dash and I just want to make sure before have to remove my dash to check on them and if they are intact I am reinstalling my egr as I cannot find a solution to my high idle with this egr removed

 

[Mcmahst]

While I’m no expert, the only vacuum line on the passenger compartment of the firewall is the HVAC control system vacuum source.