computer ecu ecm 900s

I had just replaced ( 2nd time) the heater control valve. Its 20 degrees here so I did it at my shop at work. Drove home 8 miles . Next day drove to work. Left work, went to a shopping center, about a mile away. Started the car, got to a slight upgrade and it just stopped. Tried to restart...

Hi I own a 86 saab 900 S non-turbo. great car, however, I have been told that the computer (ECU) on these 16 valve engine commonly goes bad. Has anyone encountered any issues with the computer. Does anyone have any information that could be helpfull regarding the computer. thank you much