hey my bro's 1989 maxima came home today dying..... im not sure if its the timming belt (chain) it stutters jumps from 1300-800rpms (over and over) at idle.. well my guesses are fuel rail, timming belt, distributor or a random cold day haha well if you could give me ur input that would be great thanks!!!!!!!!!!!!!!!!!!!! and if its timming belt (chain) anyone have some diagrams of the vg30de motor (sorry if i got that all wrong) well thanks in advance

It is a belt, and relatively easy to get at IMHO. Z31.com has all the diagrams you will need under their "fiche" section (though the diagrams are for the SLIGHTLY different RWD VG - the differences are negligable). Good luck!