This sounds like a possible vacuum leak and as the engine warms up the leak goes away.
Here is a guide that talks about high idle:
https://www.2carpros.com/articles/engine-idles-too-high
I would suggest focusing first on a vacuum leak. However, you need to do this testing when the engine has the high RPM. Once the RPM drops the leak is most likely gone.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
The other possible cause the the PCM thinks there is more air coming in which would be a MAF/MAP sensor issue. So let's check for codes as well
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
We don't have a manual on this vehicle as it is not offered here in the USA but I think we can still uncover the issue with running through this material.
Let us know what questions you have. Thanks
Apr 23, 2021 at 9:41 AM
