I have a friend with a 92 SHO and he has a problem. He was going down the freeway on his way to work. He gets off the freeway and comes to a stop on the offramp and the engine just turns off. He puts the car in park and restarts the engine it starts up just fine. He puts the car into drive and the engine died and all the warning lights came on just as if you weere starting the engine. His mechanic is stumped any ideas?