Hopefully someone can answer this in the next hour or so. What should my fuel rail pressure be at idle or whatever RPM it is supposed to be read at? I am trying to diagnose my low power problems while the shop I work at has an open bay.

 

Oh about 39 PSI plus or minus a few pounds.

 

That ^ should be the pressure at idle. Clean the throttle body, do a full tune-up, check the ECM for codes, check for any exhaust leaks, check for vacuum leaks, all these will help you find those lost ponies.

 

a clogged cat converter will also rob power

 

At idle with vacuum attached to the FPR it should be 32-35psi, and if you remove vacuum from the FPR it should jump to 39-45psi.