1991 Chevrolet Blazer runs rough and dies at stop

starts ok. Runs very good most of the time. Then when I stop, it will will run a little rough and die. not all the time tho.
most of the time can’t even tell it’s on until you hit the gas. Every thing controlling fuel is no more than 2 months old. Acts like idle needs adjusted but on this model there is no adjustment. Any ideas?

First, I’d clean the throttle body and IACV (intake air control valve).

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