I have a throttle body question

its the decaying idle rate clean your maf wires this will help especially if you just cleaned your K&N or have cleaned it with out cleaning the maf also, the oil gets on the maf wires and messes the idle.

on a side note unless you have bolt ons your TB may actually be costing you a little power... but regardless i would clean the maf wires with some electronic contact NO RESIDUE cleaner froma autozone or where ever it may help alot, also the IAC (idle bypass valve) is located behind the throttle body between theupper intake and the firewall its cylinder shaped it may need replacing/checking the throttle body may be throwing it off.