Do the FPR and the other vac pot on the fuel rail of a 4.6 dohc run straight off manifold vacuum? Or do they have vacuum reduction in line for one or both? I have one manifold port just behind the throttle body, and I think there are 2 more on the back of the manifold too. Near as I can find, that's all that's left to plumb on the vac system. Thanks!
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