disapoining et

Hear is an "off the wall crazy"! With it idling, pull the plug wires off the distributer to make sure each cylinder dies it down. If it idles down (and rough), plug that wire back in and move to the next. Had a guy with a dart that couldn't figure out his problem, took it to a couple of mechanics and no luck. I found a dead wire. He was running on 7 cylinders. One plug wire and PRESTO, that car sprung to life! Your issue is going to be at least that drastic, and yes I agree with everyone else, that carb needs replaced.