Hello,
When your vehicle's engine has a high RPM's it is usually due to a vacuum or intake leak. An intake leak is defined as letting unmetered air into the engine from the Mass Air Flow sensor[MAF to the engine's combustion chamber. Unmetered air is any airflow that the Power-train Control Module[PCM], or computer, has not accounted for. Here is a link below to a guide that will explain how to find a vacuum leak a little better:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Please go through this guide and get back to us with how everything turns out.
Thanks,
Alex
2CarPros
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Monday, January 13th, 2020 AT 6:40 AM