a kickdown switch is a small switch that when you floor the throttle pedal, the switch is activated, and kicks the transmission down a gear from it would normally be, for sudden accelleration, to determine if its stuck, you could test the wires with a multitester, or drive the car, and "activate the switch" and see if the tranny shifts down a gear.

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion