I only brought the car Sunday lol sometimes it's fine then other times it's not... Sometimes the idle is high then after being off for a while it sorts it self out ... I know it's not rapid but I had a micra 3 years back and it was the same engine so I know how it should drive lol
Mine was doing the same thing, being my first car and first Micra I did not really notice it that much till it started cutting out on start-up and would not get to 60mph.. I replaced the only other thing I had not tried which was throttle body and MAF sensor being the cheaper option I went for that and it cured it ran fine and managed to get passed 60 again, If you want to try other options first I changed the fuel filter which made a noticeable effect till it started doing it again..