don't adjust the distributor... that has nothing to do with a jumpy idle. It is a vaccum leak of some sort. When the FITV or IACV sticks, it lets too much air in and the engine revs higher. One time my IACV fell off and my car idled at 4200rpm... all from a hole that is about 5/8" around... I ducktaped something over it ( i think it was a quarter, i cant remember) so I could make it home.

Hey when you are driving down the road and you let off the gas, does it decellerate hard? Sometimes the butterflies in the IM will stick. If the bushings in them wear out they will get stuck. It happened to me once. The bushings are nylon, and somehow they deteriorated and the butterfly got stuck open, which makes it run like shit at low RPM...