I bought a rebuilt carb from a local import carb rebuilder 11 months ago to replace the one on my truck that was running rich. It had fuel in the exhaust and would have fuel on top of the carb when I removed the air filter cover. It ran fine until a month or two ago. Now, it's got the same symptoms as before with fuel in the exhaust and on the carb. It also is hard to start when it's warm and will die for the first couple of hundred yards unless I give it a little gas at idle.

There can't be too many things that cause this and it has to be related to the carb, correct?