UK Car Repair: About Vauxhall Zafira timing belt, vauxhall zafira, vacuum leak

Question
my vauxhall zafira recently started to cut out at traffic lights and roundabouts, it starts up again after 2-3 minutes, do you think that this is a timing belt issue, or something else?

Answer
it doesn't sound like a timing belt issue it sounds more like an idle speed control issue if the car won't idle when you stop one. cause of this can be a vacuum leak as these will lower the idle speed to the point of stalling is the vehicle hot or clod at the time? or does it happen all the time? If it is only when cold/hot the the CTS is the usual suspect let me know - thanks - Paul