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too rich = too much fuel in the mix; unfortunately, i don't know enough about boost setups to know what controller you'll need to adjust the air/fuel mix.
you'll get more help if you describe the application/engine (and fuel system), and if this is boost related, it might get more attention in the turbo forum.
yes i believe that the 2 could be related: improper fuel mappings in certain rpm ranges, but that's just a shot in the dark; I'm sure one of the veterans will have an answer...if you can be a bit more specific about what you're running.
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