Best engine that I have ever ran,so smooth. This thing revs to the moon.back to the ?.Use the second needle if u still have it. it seems that needle makes the idle smoother from my testing.The setting is 3 7/12 high end,low end 3 10/12 is were my sti is right now at 3 gallons. Ck idle gap make sure that it is not too wide. Tune the high speed needle after that lean the low end needle intill u got a even engine speed after u rev it and go back to idle when thats done then lower the idle, then drive it and check temp it should be close. make sure when tuning it fully warmed up.hope this help.btw I use the od 77t but u should use the 97t .I think that would be a better range for that engine.