Being somewhat of a novice, I am trying to time my 3.0L Volvo with electronic advance. The timing mark does a strange thing. It seems to settle at a particular point, then disappear. Only to show up again a few seconds later, and I can see it work it's way up the timing pulley and stabilize at the same point. Then do it all over again. Is this normal or am I seeing things or just loosing my mind?