1991 Other Oldsmobile Models miss firing during accelaration

Engine problem
1991 Other Oldsmobile Models Front Wheel Drive Automatic 233000 miles

My car miss fires when I try to go into passing gear on the intersatat ti get past a car or truck, or try to tromp down hard on the gas pedal in town. It seems to run fine during normal running. The engine was rebuilt at 199000 miles It was last tuned abut 5 years ago.