startup clunking noise on a 09' impala. it stops after 10 seconds

Hello, could you share more information? Is this a momentary or temporary clunking noise from the engine as it starts to run? Noises are difficult to discern in a forum like this, so I'd strongly recommend a hands on - ears on inspection by a shop near you with a skilled and experienced technician who can weigh in on the noise. Naturally, any noise that is unusual originating from the location of the engine sounds like a less than desirable thing! So do not delay and keep driving before resolving. https://repairpal.com/auto-repair-near-me If you have any other questions, please call us at 877-913-1554! We'll gladly find you a certified RepairPal shop in your area!