Your idling high because your car is LEANING OUT, most definitely start with vacuum leaks, hoses throttle body intake manifold. Move onto sensors that read air flow, I.E Bank 1 Air Fuel sensor and bank 2 Air/Fuel sensor. Next move to MAF's(not likely as you would throw a Air Fuel code and the air fuel sensor.
Bottom line
1)Vacuum leak
2)Sensors monitoring vacuum and air
3)Exhaust leak BEFORE A/F SENSOR
4) Fuel drop off causing car to throw more air through the chamber
Check by disconnecting MAF's and seeing if idle changes or fluctuates at all that will rule out the sensors.
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