My 2 Cents
Deffinately sounds to me like your piping isn't ran right all the way and u deffinately still have a vacuum leak
I do remember another thread that was discussed stating if your not going to hook up both pcv hoses to the intake, the one ontop the valve cover and from the block you should put a filter on them because it will cause a another vac leak. As for the idle screw, I don't beleive it will work properly with out the iac tubing (mess) is hooked up.