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The idle or full-throttle switch out of adjustment, so it changes state at the wrong point. These are found on older cable-throttle engines, where a switch rather than a potentiometer tells the module the throttle is closed.

A switch that never reports closed keeps the module out of idle control, so idle is high and unregulated and overrun fuel cut never happens. One that reports closed too late gives a hesitation off idle. It is an adjustment, not a part — the switch is usually mounted on a slotted bracket — so check the reported state through the pedal's travel before ordering anything, and verify the throttle stop and cable free play first, since both move the point at which the switch operates.