Dodge Durango with codes P0507 Idle control system rpm too high, and P2173 Throttle actuator control system high airflow detected. I could tell the upper intake had been off before due to some missing bolts. This also had a new throttle body on it, and it was spotless clean. When you have a vacuum leak on a vehicle that uses a MAP sensor, the extra air gets extra fuel added to it because the MAP readings show a drop in vacuum. This results in a higher than normal RPM. The smoke machine is a grea