I would try all the above suggestions. A couple more to add. When it's warm and idling lousy, close the choke blade a little at a time and give the engine a chance to react. If as you begin to close the choke blade, the engine seems to smooth out and run better, the engine is LEAN for some reason. If it just runs worse and worse as you close the blade, the engine is running RICH and you need to track that down. The above assumes the ignition is working properly, the base timing has been checked and the vacuum advance is working. Did this situation happen all at once one day? Or did it get worse over time? Another quick carburetor check is to see if the idle mixture screws react to adjustment. Turn each in 1 full turn, then back out 2 full turns. Give the engine a chance to react. If no reaction or only one side reacts, you have isolated the problem.
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