Hello: You do not say what city are you in, but I would like to know if they already checked the starter engine, and the postmission of the time band, I suppose that they already changed it, if that band is a vrincado tooth, it works but with failure, it shows because in low this trembling slightly but when accelerating it works apparently well, it can also be failing the position of position of the cranker I include more to think that the starter engine does not have enough speed to start, they must be 325RPM, or the band is not exact.
I am in Matamoros Tamps. Mexico, and I specialize in Nissan. I also have contact with workshops of almost the entire Republic in case I can serve you something.