Car loses all electrical power while driving, stops running, wait 5 or 10 minutes and I have full power again. It will run for a few minutes and it will lose all power again...wait 5 or 10 minutes and I have full power again, start it up and it runs for a few minutes and we do the same thing all over again.

SOURCE: runs ,then loses power after driving for 30-60 minutes.

AIR IN THE GAS TALK

SOURCE: While driving at highway speeds

Had a similar problem with 88 SAAB 9000 some years ago. All above solutions were suggested by various people and machanics tried everything, but problem persisted intermitently anyhow, till machanic from AA (rescue) suggested it was an electronic ingition related unit that sits snug against the body inside the engine compartment. When this little item was replaced (it's about 2 inches square and is very simple and relative inexpensive to replace) problem was solved forever.
John.

SOURCE: Mercury Topaz loses power while driving, and stalls out

Check fuel pressure. Sounds like a bad pump or plugged fuel filter.

SOURCE: i have a saab 9000 cde 1994 it drives nice but

Make sure all your injector connectors are clean and not corroded. make sure you have the correct resistor sparkplugs. And if both of those things are okay you probably have a bad direct ignition cassette.

SOURCE: Car stumbles,hesitates,loses power on Hwy, randomly

Did you check earth connection of electric system?