'84 2.3l should have a carburetor, so no IAC(idle air control) Valve
Fuel injection(EFI) started in the '85 model, EFI does require an IAC Valve.
My guess, from provided info, would be the Automatic Choke is either not working or is out of adjustment.
On the side of the carb you will see a big black plasic cap, inside that cap is a spring that is connect to the choke plate.
When cold that spring is tight and closes the choke plate, this raises the idle and causes more fuel to be sucked from the jets, cold engine needs more fuel.
The spring is either heated by electricity or exhaust or coolant, as the spring heats up the choke plate slowly opens, this lowers the idle and lowers the fuel being used.
Pull off the air cleaner or its tube from the top of the carb, so you can see the choke plate.
Engine should be stone cold for this, manually open the throttle, when you do this the choke plate should spring closed, if it doesn't try to move it manually to see if it is stuck.
If it does move then loosen the 3 screws on the plastic cap and turn it until choke plate closes.
If it never closes then you will have to rebuild carb or see if you can find an old carb and get the choke parts from it.
If it does close then start engine and it should stay running but............let it warm up and see if choke starts to open as it does, you will have to manually open the throttle or step on the gas pedal during this time to allow choke to open.
If it is not opening then previous owner has disconnected/disabled the automatic choke system, if it looks like a wire was connected to the black plastic cap you will need to find that wire and test it for 12v when engine is running, and no volts with engine off.
Last edited by RonD; 10-08-2014 at 12:43 PM.