I have an auto LS and my idle starting up is low and when warmed up its idles low as well..

I have cleaned out the aicv,fitv, and did a valve adjust. Not sure if i did this right, but i connected the vacuum pump/gauge into where the brake booster goes and it reads 10-15 psi moving up and down rapidly..

can someone help me?? does that mean i have a vac leak? how do i start if i do have a vac leak?