Ha! this whole time I've been running without a vacuum line going to the FPR

[bcam347]

WTF!

damn previous owners

I think I solved the idle surge

 

[408WBlackCoupe]

Found mine is missing to where does it come from to the FPR.

 

[bcam347]

Found mine is missing to where does it come from to the FPR.

mine has a 1/4" nipple on the side of the intake neck, same size as the FPR, pretty sure thats it

 

[Boydster]

Found mine is missing to where does it come from to the FPR.

Intake manifold vacuum. Chase out your lines from the trees on the intake (underneath the upper intake, above the injectors on the drivers side) and on the firewall. Find the spot thats open or has been capped.