My son was driving his 08 Saab 9-3 2.0T home from college last night. He was going 60mph on the highway when all the sudden the engine shut off. He still had all electronics, just no engine running. He then tried to restart it, but nothing would happen. It still had all power and lights, just wouldn't turn over or even try to start. He waited about 20 mins and then it started right up. It ran rough, but he made it home without it dying anymore. This morning it still starts up, just runs rough and doesn’t feel like it has all the power. Any ideas or help??