One problem related to check engine light on has been reported for the 1999 Oldsmobile 88. The most recently reported issues are listed below.
1999 olds, delta 88 - starts hard, engine dies [hot and cold] in motion [lower speeds] and stopping at lights. Fuel pump, filter and strainer replaced. Fuel pressure now in spec. Check engine light never on and no codes present. Problem continues [last 20 days].