I'm sure (at least 99.99% sure, since I'm not familiar with the DF300) that the idle air on the 300 is controlled by the IAC, and the throttling is done by a throttle plate, same as a cabled system. The conical plunger moving in and out of a machined seat is much more sensitive to minor idle speed adjustments, but the amount of air needed under power still requires the large throat and plate setup provided by the throttle body.
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Linear Mode
