weber idles fine then lopes
So just like the title says, when I'm driving and I come to a stop light, wait to for an old lady to cross the street, etc. the Jeep idles very stable, the rpm gauge holds steady and the Jeep has a nice low shiver at about 500 rpms. It will idle great like this for probably about 15-20 seconds, then it starts to lope a bit. When it starts loping like this it doesn't ever die. Then I take off again, stop at the next stop light and the same (an idle that would make a mother proud and then 15 seconds later starts loping). It makes me think that it could be a float problem, because it idles fine and then the bowl somehow pushes more fuel through to the intake along with the idle jet fuel causing it to lope? I'm not sure. I have the fuel return line connected, and I think it's not clogged (i'm not sure how to test this).
Weber 32/36- (I have gone through the best lean idle adjustment many times)
Timing- either 8 or 10 BTDC, I can't remember off hand.
Vacuum advance is connected to manifold vacuum.
I read that the fuel return line is enough fuel pressure relief to the weber without having to get a pressure regulator, but I'd like to know what others think. Thanks!