It seems like the rpm hangs when the throttle change is gradual, but when there is a rapid increase in the throttle position it does not hang and returns to normal.
I kind of think that the throttle blades might be hanging when the throttle is closed softly, but when the blades are allowed to snap back notice they close all the way?
Also, what is your IAC ramp down settings? You can lower the Ramp Decay Time to allow for a more rapid return to idle rpm.
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