Possible ECU issue

Welcome to 2CarPros.

First, this vehicle isn't available in the US, so my technical information is very limited. However, this doesn't sound like an electrical issue, but rather either a idle air control valve issue or the throttle body needs cleaned.

The idle air control valve (IAC) is responsible for maintaining the engine idle speed. It is located on the throttle body. Here is a link that shows how to replace one. I'm adding this so you can have a general idea what you are looking for. I suggest locating the one on your vehicle, removing it, and making sure it is working and there is no carbon build up where it enters the throttle body. The best I can offer is this. Once it's out, have a helper turn the key from off to on. You should see a slight movement in the pintle.

Here is the link. I am also adding how to service the throttle body. Try these things first and let me know the results.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

https://www.2carpros.com/articles/throttle-actuator-service

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Let me know what you find.

Joe