About a 1993 740i transmission.

What is your question?

I have a 93 740i that I got from a little old man and woman. They serviced the car exactly on time and by bmw service e center. Only 134,000 miles on it. But it seems that the transmission takes off sluggish. When I attempt to put it in economy mode. - the display just flashes back and forth from winter to economy. Am I engaging it wrong or could some one tell me if this a computer reset issue..???? Thanks for any input.