This is infamous on most 240sx. I can't explain why either. On my old 240sx, if I shift into neutral while coming to a stop, sometimes it would totally die and stall out. On my current 240sx, I don't seem to have a problem with the idle. On my old 240sx, to combat the low idle/stutter, I would turn my AC on all the time raising my idle a bit and blip the throttle.
Its either related to, vaccum leak somewhere or some people have said dirty IACV.
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