Started the car (1990) from cold this morning, hood opened and noticed that the idler nearest the alternator was bouncing/swinging (towards the pass. side) just a little bit - maybe 1/4" inch swing...it did it 3 or 4 times and then settled down. No noise. No balancer wobble. Belt is used with no breaks, tears, etc.
Why was it jacking around and then stable?
Why was it jacking around and then stable?