One problem related to service engine light on has been reported for the 1996 Oldsmobile 88. The most recently reported issues are listed below.
Applied pressure to brake pedal to stop, brakes made a thunking noise and the brake pedal pulsated excessively, abs light on dash illuminated. Took to dealer for inspection. They found the electronic brake and traction control module to be faulty. Replaced module and paid for repair. Engine problem started car, slight backfire occured, service engine soon light illuminated, car rough idled, had slight loss of power. Took to dealer, they found the upper intake cracked along with the lower intake and gaskets to be cracked. Replaced at cost to me. Dt.