cuts off

so i have recently bought a vehicle, a vauxhall astra 1.4 2004 new shape. I have changee the timing chain and serviced it however i have a problem where when i drive the car for more than 20 mins and i stop at a traffic light the car cuts off and spanner lights cones on, it takes a few seconds...

Hi, I bought my Vauxhall Insignia 2011 2.0 diesel, automatic (211000 miles) and the problems started. At the beginning was shaking while driving about 50mph so I have changed the following: - driver driveshaft - timing belt, water pump, alternator belt (was necessary) - oil filter, fuel...