For a factory Mustang expect a slightly different behavior when the car is moving vs stopped. But in general it's NORMAL for the idle to hang around 1000 RPM (fast idle) before slowing to a slow idle.
For a factory Mustang expect a slightly different behavior when the car is moving vs stopped. But in general it's NORMAL for the idle to hang around 1000 RPM (fast idle) before slowing to a slow idle.