If it is a caburetor vehicle setup carburetor, if it is electronic fueling , check module with a code reader.
Is this a caburetor, or injection model?
Check air filter, check eventually check and replace spark plugs, and if there is a fuel filter replace it.
Once you do this basic maintenance you need to set up speed screw and mixture screw on carburetor:
CARBURETOR SET UP AND LEAN BEST IDLE ADJUSTMENT
If it is an electronic injection model you will have to connect the electronic injection module (ECM) to a code reader, and you start troubleshooting from there.
Both jobs are not too difficult , but can give you further troubles if you have never done them.
In this case better going to a mechanic to have carburetor or electronic injection registration done.
Particularly, if the mechanic turns the mixture screw a bit more, the car will waste a bit more fuel but it will idle fine.
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