Using anything electrical affecting idle?

[Mangudai]

Say I turn the steering wheel while im parked, the idle will drop down about 150 rpms then raise up about 100-150 rpm. So if im at 750 and turn the steering wheel the idle will drop down to 500 then come back and stay at 900. Sometimes it will drop back down to 750-800 ish but why is this happening? It also happens when I turn on my headlights or turn my a/c on. I also notice my rpms dropping when I brake sometimes (abs engaging?). I'm thinking its a grounded out wire from the things I've read on here but where should I look?