rear deraileur adjustments
i recently replaced my rear dérailleur, and no matter how much i fiddle with it, i cant get it to shift properly. the shifter is a shimano deore M771 long cage. the problems that im having is that it shifts several gears at a time, and when i get to lower gears from about 4 below, my chain comes completely off and gets stuck in between the wheel and the cassette. anyone know how i should adjust the dérailleur or any tips on what needs adjusting? whether its the cable or the alignment screws?
thanks for any help given.