if its the IACV it wouldnt stick in one place it would constantly fluctuate 1000-2000-1000-2000 like as if soone was reving on you.

if its really cold where you are it could be the timing since the ecu advances the timing every 11 degrees when the rolling intake temp drops.

if its your timing heres a test when the car is idling just tap the gas about 1/8 if it drops back down to 700-1000 then its your timing cause of the cold weather.