Alright I made a video of what is happening to my advance when I rev the engine. http://www.youtube.com/watch?v=S--xJZM6tyc

Should I just re-re-rebuild the carb?

I tried Tom's method and the only problem with the procedure is I have to set the mix first and there's obviously something wrong with it because it runs best with an 1/8 turn out.

I set the timing pretty well because it barely pings on occasion

EDIT: Alright now this is just more F'd up than before. Now the idle mix screw doesn't really affect the idle at all and I just sprayed everything down with penetrating oil to find vacuum leaks with no success.

I also just looked at the advance and it doesn't move at idle whether it's plugged into the advance port on the carb or not

The last thing I was thinking of is the idle tube fits into the hole very loosly. If I remember correctly, it was pretty tight before. Would this let in extra gas?

Last edited by snowman4839; 08/23/10 10:58 PM.
69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.