There is a screeching/hissing sound coming from the fpr. Its kind of loud. There are no fuel leaks, no smell of fuel. Anybody know what the problem could be? All vacuum lines were checked and are okay. There are no idle problems.

 

might be a small crack in the top of it where the vaccum hose plugs on.

 

I will check it. Anybody else?

 

Try possibly replacing the O-ring on the FPR it-self but since your saying its a hissing its mostlikely a cracked vacume line or something.

 

or if the top screw/nut was tightened down to hard, maybe the casing cracked?