I've supercharged my 350z and I have put in a larger fuel pump. While I was getting the tune my tuner said it's running rich at idle. What are my options on fixing this issue? He did go on about jet valving but I can't find any info on what that is.

 

If you have an aftermarket ECU or a reflashed stock ECU, he should be able to adjust the fuel maps (AFR and Injector + Fuel Pump duty cycles) to compensate for the upgraded Fuel Pump and Supercharger. Did you also upgrade your fuel injectors or are you running stock? What about a wideband O2? What supercharger kit did you roll with?
Cheers!
-Icer