With a carb, the single plane isn't as efficient at low speed (street driving)due to a weak signal to the carb (low speed air not drawing fuel through the carb). With efi, fuel delivery is not dependant on a vacuum signal, so fuel will be consistent at low speed. With mpfi there isn't even any fuel in the intake runners so fuel puddling in the intake is non existent. The single plane works very well with efi.
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Chris
1969 Firebird: injected Pontiac 462ci, T56
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