As stated it would help if we knew the CO and HC level.
A high CO is a rich mixture and will always lead back to problems in the carb.
A normal CO with a high HC is fuel that is not being burnt for some reason and is very seldom a carb problem. Ignition system malfunction such as bad plugs or wires. Anything that will cause a miss. A very lean fuel mixture that causes a misfire caused by vacuum leak in hose; intake or stuck open egr valve. Low compression or timing to far advanced.
From what little info we have to go on it sounds like you have a miss at idle. First thing I would do is replace all the vacuum hoses and spray starting fluid all around the intake looking for air leaking into the system causing a lean mixture. Also if the plugs and wires are old replace them.
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