It is possible that while adjusting, you forced the airflow plate down and it is binding/dragging. This might also be the cause of your rich idle, the plate might not be returning to rest.

Get down to the airflow meter, lift the plate gently and check for free-smooth movement. If the plate is dragging on the sides of the opening, you will need to loosen the screw in the center of the plate and re-center the plate.

Don't get too rough with loosening/tightening the screw.

The plate should also be within the narrow part of the opening when at rest, that adjustment involves bending the clip on the spring IIRC. It is all outlined in the FSM.

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Gone to the dark side

- Jeff