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Your idle mixture is off. If all is well under full throttle, that means you now have the main circuit going; so with no problem under the main circuit, and only a problem on the idle, and under transition phases, I would work hard on making sure your floats are at the correct level (use the PMO float bowl gauge - very simple and effective) and make sure your adjustments are correct - idle mixture (jets aren't clogged, too), air balance, etc.
I assume you have Webers - right? I have them too, and sometimes they are a bear to get working right, but eventually you'll get it.
Do a search on this board for more on weber tuning if you've never done it before, or buy a weber carb book.
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