The wipers park by continuing to run as long as they see a grounded signal from the park circuit. If this signal is not there, the wipers will stop immediately when you shut the switch off. It is possible that it is the switch, but I would guess that it is a bad connection in the wiper motor or in the harness.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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