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Taken from another forum:

This is referenced straight from the Nissan Service Manual

From a 2004 Spec V, but the same for all Nissan's with electronic TB and accelerator pedal.

I hope this is beneficial to all who use it. Note: Timing in this procedure is critical in order for it to be successful.


PREPARATION
Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied. Learning will be cancelled if any of the following conditions are missed for even a moment.
● Battery Voltage: More than 12.9V (At idle)
● Engine coolant temperature : 158-203°F
● For A/T vehicles: PNP (Park/Neutral Position) switch: ON
M/T vehicles: Neutral switch: ON
● Electrical load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied
before the engine is started, the headlamp will not be illuminated.
● Steering wheel: Neutral (straight-ahead position)
● Vehicle speed: Stopped
● Transmission: Warmed-up (Drive vehicle for 10 minutes)


OPERATION PROCEDURE
Without Consult-II
NOTE: ● It is better to count the time accurately with a clock.
● It is impossible to switch the diagnostic mode when an accelerator pedal position
sensor circuit has a malfunction.

1. Perform "Accelerator Pedal Released Position Learning"
a) Make sure accelerator pedal is fully released.
b) Turn ignition ON and wait at least 2 seconds.
c) Turn ignition OFF and wait at least 10 seconds.
d) Turn ignition ON and wait at least 2 seconds.
e) Turn ignition OFF and wait at least 10 seconds.

2. Perform "Throttle Valve Closed Position Learning"
a) Make sure accelerator pedal is fully released.
b) Turn ignition ON.
c) Turn ignition OFF wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming
the operation sound.

3. Start engine and warm it up to normal operating temperature.

4. Check that all items listed under the topic "PREPARATION" (previously mentioned) are in
good order.

5. Turn ignition OFF and wait at least 10 seconds.

6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3
seconds.

7. Repeat the following procedure quickly five times within 5 seconds.
a) Fully depress the accelerator pedal.
b) Fully release the accelerator pedal.

8. Wait 7 seconds, fully depress the accelerator pedal and hold for approx. 20 seconds untill
MIL (Malfunction Indicator Lamp, a.k.a. SES light) stops blinking and is turned ON.

9. Fully release the accelerator pedal within 3 seconds after MIL (SES) turned ON.

10. Start engine and let it idle.

11. Wait 20 seconds.


Procedure timing chart
IAVL pic.bmp


12. Rev up the engine two or three times and make sure that idle speed and ignition timing
are within the specifications.
 

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If the idle doesnt stick then it would very likely point to the TB since you had already sprayed the TB cleaner. For our electronic TB, it's much safer on the TB to spray cleaner on a rag to wipe away the gunk build up instead of spraying directly on the TB.
 

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Larger/upgraded TB are gunna have to be a custom job. Yay for electronic TBs (sarcasm). IIRC altima QR TBs ought to fit as well. Dont know of a specific company selling OEMs besides the usual autoparts stores/dealers.
 
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