1989 Civic die when stop, especially hot days



My 1989 runs great when drive. But, a problem when stop, especially in hot days (say, 80F and up).

It dies at signal light, stop sign, you name it. It generally has choking sound and die down later. When ignite again, it is up and running again? Would it be PCV valve? Idle valve?

Any information on diagnostic/ next steps is very appreciated.