I have a 2001 maxima 240k and it stopped idling one day. no codes so I went and but a ne IAC valve in it and it idles real low now around 400 rpms. so I went and had nissian do the relearn still low idle and it is low only when I take my foot off the pedal slow if I stab the throttle fast it will die, it will idle high when cold as soon as it warms up 400 rpms does any one know how to help me. it does have a evap leak would that make it idle low?

 

I read in another thread where this year Maxima had issues with the active motor mounts. You might try unplugging them and see if that helps.