BAMBAM11336

i cant get my idle to go down past 1100 or it will die,ive adjusted both idle screws,it runs pretty good at 1100 besides a sputter here and there im not shure how these rotary's sound when running good.could it be vacuum.i also noticed on the passenger side of nikki carb there is a hole like the size of a dime and nothing attaged to it,its not vacuum.in some photos of stock nikki's i see a plug with a red and black wire coming out of the hole im talking about,am i missing a sensor or something? please can some one help.idle surges a little also.