My 98 cherokee classic has the tried and true 4.0L.I started it up the other evening and I hear a squeaking noise coming from under the hood.I traced it to the distributor with a mechanics stethoscope.Is this a possible bearing or bushing going bad?If the distributor has to be replaced is it the standard s.o.p. to replace it or is it more involved?Any input would be greatly appreciated.