1990 buick riviera

i am having a problem with my digital dash, it keeps going black and then the car dies and won't start. after a while it will start again but there will be no dash lights. i am thinking about changing the whole dash however am unsure where the computer is. can anyone tell me?

Welcome to AF, I don't think the dash quitting in itself is causing the stall. Go to autozone.com, repair guides for component locations. Try tapping the pcm, see if the cars stumble or stalls, and yes the digital dashes just about all failed at some time in their life.