injector hissing?

[Mr Lee5353]

ive been trouble shooting my new car (repomans red hatch) on why its running like crap...if you remember the previous owner (RFcool) checked other various stuff but thought it was running rich becuase of the fuel pressure being too high. so i bought a fuel pressure gauge and a AEM uego and got the pressure set to normal. according to the wideband its running ridiculously lean at idle but then goes rich under load. i noticed a sound like a vacuum leak coming from what i thought was the fpr, but listened more closely and noticed it was the injector. i unplugged it and it didnt change the motor so i figured it was a bad injector. but then i went back to the posts the PO posted and he also thought the injector was bad, so he switched 2 of the injectors and the injector was ok. any ideas?

[Mr Lee5353]

no one? its not the fpr, its a nismo btw, because it adjusts the pressure and changes with the vacuum on and off.

[CSUPUEBLOTIM]

I would go through and test them all with a meter. Did you install new o-rings with the injectors?