hey guys, same thing is now happening to me (13 Nismo with 19k miles) it started 2 days ago and I remembered seeing this thread a while back.
so I figured I'd see what the dealer says
took it there today for the throttle problem and vibration during braking
this is what they found and are doing
-code for abs sensor
-warped rotors
they ordered the sensors and should be here in 4 days, then when I come back to have them installed they are going to give me a courtesy car and do both the sensor and resurface front brakes free under warranty.
I know this will fix the vibration but I hope it fixes the throttle problem too and if not I they will fix whatever it is under warranty they say.
so I'll let u guys know what the outcome is after
on a side note I ordered some nice saikou michi dual catch cans
similar set up to this but all custom dimensions and black lines that I will tuck to look and keep everything more clean.
DIY: Dual Oil Catch Cans 370Z
also I'm still going to clean throttle body's and Intake Plenum either way