Check your air valves in the front.. oh i cant think of what they are... in front of the carb.. I have been fighting with my jeep for the past month with diening out and rough idle and the works... I cleaned the needle out in the fuel inlet to the carb, new fuel filter and found i had a bad plug, replaced it and messed with the air valves in front of the carb and the choke was off some how, Runs so smooth can hardly tell its running.. What kind of carb are you running.. check for AIR LEAKS! Spray carb spray around it and if it idles higher you have a leak... Also another problem I had was air intake into the carb was all messed up.
edit: SHUT THE AC OFF.. TOP AND DOORS OFF!!