4age idle speed

[vorn]

Hi everyone, i have a 4age supercharged levin (ae92)
the idel speed differs every time i go to idle . it sits at between 800rpm-1200rpm , i have notice that if i sit for a while (eg in line at mcdonalds )it seem to sit at 800rpm but after i get moving it changes.
i have read in other posts that say the idle speed is related to water temp. maybe this is my problem , can anyone give me any ideas on what i can check ,??