My vw sharan keeps stalling when im driving. There is no forwarning it is going to hapen?

Its only started recently but its a bit scary when your driving and the car just cuts out. Ive had the engine tested via computer but nothing shows up. One mechanic said it was the crank sensor or the Ignition module but the other mechanic said it cant be that but could nt say what else it could be. I dont know where to turn because people are saying diffiernt things. Help!My vw sharan keeps stalling when im driving. There is no forwarning it is going to hapen?Best bets would be to go to a VW specialist, not normal mechanics. Sounds like it could actually be the ignition module though. Hope you get it sorted, that could be dangerous.