Fluctuating Idle Issues with 14MPG constant

My idle is a bit crazy. It is totally perfect at startup. It starts at about 1500 and then after about a minute it drops to about 800, which is about 6.6 % of my injectors. But at every light, it is at about 1300, which is about 9.5 % of my injectors. This is seriously killing my gas mileage. I have been averaging 14MPG driving her nicely. I think it is due to the constant 4% more fuel when sitting in traffic. Do i simply need to adjust my Idle speed control valve, or is it due to my Blitz remapping? Thanks for reading!
 
I just read this:
DegreE;907484 said:
Pull your air idle control valve out of your intake manifold.

Buy 1 can of Brake Cleaner and spray inside the pipe (all of it @ both ends).

Blow out the remaining Brake Cleaner with comressed air.

Reinstall.





I had the same problem with my Supra when I got it. It idles flawless now. Good Luck.

Is that suggested for my issue also?