mine does the same, I just chalk it up to one of those weird things a turbo car will do.. I've been tinkering with turbo cars for awhile, I've learned to ignore the little things, slight strange noises that will drive you crazy if you get paranoid, etc.

95% of the time my idle sits steady at 800, sometimes it will creep up to 1000 for a few seconds, but it comes right back down.

 

Have your tuner set you idle to 800 or do it yourself, and you'll be much happier guys.

 

Mines at 1000-1100 usually

 

idling around 775 with a slight bounce, used to fluctuate more before i had the cobb ap and aem intake.