Torque (Or Viscous) Converter Clutch Brake Switch
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1987 Pontiac Grand Prix, 1987 Pontiac Firebird, 1987 Pontiac 1000, 1987 Oldsmobile Cutlass, and 1987 Oldsmobile Custom Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
The torque (or viscous) converter clutch brake switch must be adjusted to prevent vehicle stalling at idle. Ensure brake pedal is fully released. Adjust plunger to just touch brake pedal lever.