Here's a link to your code p0505.
SOURCE: 2004 xterra P0505 code-idle air control
IAC valve has gone bad. Its located on the throttle body and is what controlls/keeps the vehicle running at idle.
SOURCE: nissan ga15 engine idle adjustment locations
The idle speed is computer controled, it is not adjustable, you most likely have sludge in the throttle valve and the idle speed control air bypass valve, clean them with carb spray with the engine running.
SOURCE: Idle Air Control System
Replace the idle air control valve and see if you still get the same error code.
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