PROBLEM!!! 1988 buick century limited wont run after warmed up

[krsd18]

i recently bought a 1988 Buick century it runs great until it warms up and i stop for about 10-20 minutes then it will start but instantly stall unless i feather the gas but as soon and i put the gas peddle to the floor it will rev up a little bit but stall out I've already replaced the spark plugs and wires and i also blew out the catalytic converter but no improvement at all im going insane trying to figure this out