Engine is revving when still

2012 MAZDA 5
112,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC
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KMGT00
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When I am parked or have my foot on the brake, my car will rev, sometimes up to 3 or 4 on the dial. The original error code was the Mass Airflow Sensor. We changed that yesterday, and it is still revving and it shut off twice within ten minutes in a parking lot. It shut off without making a sound. We took it to get the code checked and it still says Mass Airflow Sensor.
Feb 3, 2019 at 10:47 AM
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STRAILER
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Hello,

It sounds like the throttle bore is dirty. Here is a guide to help you fix the problem. Leave the actuator plugged in so it doesn't disturb the computer. The diagrams for your car are below.

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Feb 4, 2019 at 2:27 PM