For whatever it's worth it might help some one out there. Worked on a 04 Altima with a trouble code P0507, this is the work i did.
Removed throttle body cleaned it with carb cleaner, removed pcv cleaned it. Preformed an idle air relearn procedure using a simple uncomplicated method which is as follows: warm engine to normal (1) TURN IGNITION ON 2 SEC. (2) OFF 10 SEC. (3) ON 2 SEC. (4) OFF 10 SEC. (5) IGNITION OFF 2 SEC (6) ON 10 SEC. (7) WAIT 3 SEC. PRESS ACCELERATOR 5 TIMES WITHIN 5 SEC.
(8) RELEASE ACCELERATOR WAIT 7 SEC. (9) PRESS ACCELERATOR 20 SEC. (10) IF YOU PREFORMED PROCEDURE CORRECTLY YOU SHOULD SEE CHECK ENGINE LIGHT BLINKING IDLE SHOULD BE AT 700RPM. DISCONNECT BATTERY FOR 1 HOUR TO ERASE CODE.

worked for me