anyone know what the knob is for in the glove box,, seems pretty hd,, makes about one revolution... also the one near the gas cap,, think that is for idle speed,, mines not working,, seems more like a vacuum line w/plug in the end,,, or is that what its supposed to be connected to a idle adj. screw? idk,,, am I not getting crazy enough w/it? its not moving. thanx