Audi A3 Quattro cut off when i stop at a light and turned back on. Did it again but this time it wouldn’t come back on. Changed the battery and alternator and still same

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. ' It is not typical for coils to cause a stall when stopping - but it could happen if multiple coils fail to fire simultaneously. As I always say - it's best to repair what you know to be faulty before guessing about or trying to pursue anything else. Engine performance values may be in question due to the battery being changed plus known failed components like coils. This could cause the engine idle speed to not be properly "learned" and can lead to a stall. Start with your known issues and then recheck operation. If you should need local help, contact a shop near you -- https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.