Introduction and Question

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Hello everyone, my name's Jim and I'm working with an 01 Maxima. It was having the p0505 code and the hunting idle between 1500 and 2000 or so, I researched and replaced the IACV and though at first the problem continued, after a drive, it began to idle properly and run just fine. I returned home and parked it, but when I went to crank up again, it would not start and run, it will start and then stall out, if given a fair amount of throttle it will then run just fine for as long as you want but will have an increasing hard time starting each time. Once running it idles fine and runs fine. I have heard there is an idle relearn procedure but it does seem to idle fine, there is no check engine code as yet. Has anyone ran into this problem before? Any help is greatly appreciated.Jim