Platinum or iridium plugs???? Also I brought my 04 g35 used 1owner 98 on carfax n 56k on It sports package n everything 4 12k! What should I chang, should I get a tune up I mean I'm a little stumped here! Help,lol! 1 more thing, I live in queens ,ny I need a tuning shop!

 

Makes no difference, A tune up couldn't hurt but double check with the owner as to what's already been done and when before taking it in for the works.