Take it to a local shop that can do an idle air relearn on the car. You could try to do the pedal dance where you turn the ignition, press the pedals for specific amounts of time and twiddle the knobs in a special sequence but for $100 any shop with the appropriate OBD computer can do it just by plugging it in.
If you want to try the procedure do a search for "Idle Air Relearn procedure" or "pedal dance" and you should find the exact sequence. It usually takes many attempts and a fair bit of frustration.
My idle was off when I had the valve covers/gaskets changed and the relearn fixed it instantly.
05 FX35, Silverstone, Graphite, Touring, Escutcheon, Sport Pedals, LED Dtrl's(thanks rookie), Stillen STB, +2 Timing, Stillen CAI, LMS Z-Tube, Grrrowwl!!, Plenum is next (OK - well - actually the G35 E-brake pedal is next, but I swear, something is going to happen with that plenum).