My dads 99 Arosa 1 liter has stalled a randomly a few times on him, once as hes was on the motorway and it just stalled after he had drove 20 miles, another time it just stalled as he was parking up after driving 10 miles and the other time he had drove the my place, less than a mile and when he was leaving it wouldn't start. After each occurrence the car turns over fine ruling out the battery but just won't start. When the car is left for a while, say 30 minutes or so after a few more turns it will start and drive perfectly. No lights and the dash come on. Any ideas? Thanks.