I think I may be losing my mind. I have adjusted, readjusted, and re-readjusted my carb. I am heading toward re-re-re......you know where this is going. I have a reman (from chain auto supply store) manual choke quadrajet. I have adjusted the idle mixture about three times now. I am pretty sure I am doing it right. After I let the car sit for a day or two, it runs rich, really rich, I mean black spot on the driveway under the tailpipe rich. It acts like a stuck float. Does this type of carb have a conventional float? To set the idle mixture I have first set the timing and idle speed, then gently seated the idle mixture screws and turned them both out two turns. I then adjusted both screws in equal amounts unil the vacuum begins to drop and then back out 1/4 turn. Is this correct? If so, why would this thing run so rich every time I start it up after a day or two? It won't even idle without the "fast idle" linkage engaged, puffs black smoke, and runs like he**.