Symptoms include:
Stalling
Hessitation
Losing power
High emissions
Poor drivability
Poor idle speed
High fuel consumption

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The Air Flow sensor works by seeing how much current it takes to keep a wire at a specific temperature. The fault will often not be shown on diagnostic system as the meter will still be operating within the limits the computer believes are OK, but putting the correct amount of fuel in for idle when the throttle is fully open will result in a very weak mixture and thus a lack of power.

The air flow sensors will occasionally fail completely which will bring up a light on the dash and the symptoms described here are only the usual ones, as we have known the fault to become apparent in other ways.

Luckily throttle bodies are very easy to fit and normally only take 15 minutes you do not need any special tools to fit them and with a very small purchase price they are no major problem when there go wrong.

Micra  K11 1992-2000

Nissan Micra base idle set up after fitting new throttle body

1. Fit unit
2. Run engine unit normal operating temp
3. Run for 2 minutes at 2500rpm
4. Let Idle
5. Stop Engine
6. Disconnect throttle position sensor 
7. Restart engine & run unit stable
8. Idle speed : manual 600rpm automatic 700 rpm
9. Adjust by using screw under cable connection surrounded by a spring
10. If need be Adjust the air bypass screw.
11. Stop engine
12. Reconnect Throttle Position sensor
13. restart engine
14. RPM will be high to start with, after 2-3 min the revs should return to normal