New carb, new cap rotor wires plugs.. Runs good, gas mileage fine, but just can't get control of the idle.. Tried adjusting but that's not really it, sometimes it idles where I have it set but bounces down 200 or so then back up on a steady cycle of like every 20-30 seconds but overall stays like that, but other times it just all of the sudden drops and over ten seconds just dies.. Idle is set to 900 ish at the moment, was lower just thought I'd try givin her a little more but no improvement.. Carb is as was out of box.. Need pro attention?