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By trying to keep the engine running, the natural impulse is to add more throttle. So to make up for the restriction we try to add more fuel by pumping the accel pedal. So for instance instead of having the engine cruise at let's say 1500 RPM we overcompensate & the result is a fluctuation in overall engine speed 1250 to 1750 to 1400 to 1600, just trying to keep a steady 1500.
Dave
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