A high idle is usually a vacuum leak. A vacuum leak is going to be anything from the Mass Airflow Sensor (MAF) to the combustion chamber and includes the intake air duct, throttle body gasket, intake manifold gasket, vacuum lines, EVAP lines, and the vacuum lines, if any, that are going into the dash for the HVAC System. Pay special attention to the intake manifold gasket as this is the most likely culprit. I have included a link below for you to go to.
Please go through this guide and get back to us with what you find out.
Monday, June 10th, 2019 AT 1:05 PM