I just was recently given a 2005 ford freestyle upon looking at a coil pack for a cylinder 4 missile i noticed there is no vaccum line to the fuel rail pressure regulator. Where should this vaccum line run to and connect to on th

e engine as it's no where to be found as hose wise?

The cylinder 4 misfire just started after I changed tge fuel filter I'm thinking some debris may of been dislodged n may of clogged an injector for cylinder 4 but I rearranged the could as a test for tomorrow's drive to see if by my luck a coil went bad at tge same time. I'll probably try my loud light set on it tomorrow n check all of it. But figure the filter fuel was near black coming out of it.

 

You need to be careful with Fords concerning misfires.

If there is an ign system problem , the PCM will disable the injector for that cyl possibly sending you on a wild goose chase..

The better thing to consider would be to replace the fuel filter again and see what comes out of the filter .

What engine is in your vehicle. There is a question of possibly a fuel pressure sensor. Can you supply the engine code from the vehicle sticker on the driver's side door?