Engine wants to die at stop lights

before you get into re-tuning or changing out the carb, dbl check for a vacume leak around the carb. Ensure all hoses are connected at the carb where they should be. run the engine at idle after warming up. spray carb cleaner near the base of the carb where it meets the intake manifold. You"ll hear the carb change its tone and gurgle just a bit if theres a leak.

also check the pcv valve on the valve cover. when they go bad its a big vacuum prob.

are there any electrical issues that are happening at the same time? dimming of lights etc.