engine on 1993 Buick Roadmaster

my car starts fine then cycles through normal idle and low idle then dies all together, no codes come up and have already replaced spark plugs, ignition coil, and air filter. the fuel pump, igniton wiring, and fuel filrter have been replaced recently and seem to be working fine. any help?

Asked by for the 1993 Buick Roadmaster
special tool to monitor idle air control motor and signal to motor from computer. U need mechanic