So I finally got off my lazy *** and decided to do the timing advance (plus I just filled up with some 109 av gas this morning which made a HUGE difference in itself). Anyway, get everything ready, hooked up the timing light and figured I better check and see what it's at before I mess with anything and low and behold it's at 1 degree! Not sure if that's what was causing some of my problems with idling and running really really rich but I guess I'll find out. When we advanced it (and checked half a dozen times after we were done just to make sure it was right) we had to turn the dist cap as far as it would go and back it off a millimeter or two but it's dead on 19. After this tank of 109 is gone I'm gonna go back to 91 for 4 or 5 tanks and see how it runs and by then the cpu should have more than accepted the changes and I'm gonna try the 109 again and see what kind of difference it makes.