just to let people know i repace the dist cap with aftermarket, did not work out , must use dealer part
Wheel hubs or bearings or could be the CV shafts.
Try powering the stereo up with jumpers to a power source. If the stereo still won't work with direct power check to see if it might have a anti theft stereo. If no then replace the unit. If it works with jumpers then look for a break in the wire or a bad fuse. Easiest fix in this case would be to run a new wire from the fuse panel, (key on power) to the stereo. These cars are known for stereo problems, my daugher has an 1989 929 and the stereo dies for days and then works if someone turns it off by accident instead of just turning off the volume...