Car fine when driving but cuts out sometimes when you come to traffic light or giveways its a peugeot 306 automatic 1.6?

The issue you're experiencing with your Peugeot 306 cutting out at traffic lights or giveways could be related to several factors. It might be a problem with the idle air control valve, which regulates engine idle speed, or it could be due to a faulty throttle position sensor. Additionally, issues with the fuel system, such as a clogged fuel filter or failing fuel pump, could also lead to stalling. It's advisable to have the vehicle diagnosed by a mechanic to pinpoint the exact cause.