I too have been having similar problems with my combo for longer then I can remember. I can achieve a stable idle after the car warms up for about 10-15 min. (no choke provisions), but my car idles very rich. It is rich to the point that I get gasoline in my fuel. I have tried everything to lean it out, but when I do the car just will not idle. My car only produces about 7-8in.hg. at around 900rpm. My engine builder says it is because of the camshaft duration, but I don't buy it. I have seen plenty of cars with way more radical camshaft/engine combos. that idle just fine. But enough about my problems. Have you checked your vacuum to see how low it is or if it fluctuates? Are you allowing plenty of time for your motor to warm-up. I know these are basic questions but you have to start somewhere.
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