Why does my Audi A3 have a rough idle at startup?

I've noticed that when I start my Audi A3, the engine has a rough idle for about 30 seconds before smoothing out. What could be causing this and is it something I should have checked out?

This rough idle at startup could be due to a few different things. One possibility is that your spark plugs need to be replaced. Over time, the electrodes on the spark plugs can wear down, leading to inconsistent performance at startup. Another possibility is that your fuel injectors are dirty and need to be cleaned. If they are clogged, they may not be providing enough fuel to the engine at startup. Lastly, it could be an issue with the fuel pressure regulator. If this is the case, it's important to have it checked out by a mechanic to prevent any further damage to your engine.

I had a similar issue with my Audi A3 and it turned out to be a faulty idle control valve. This valve helps regulate the idle speed of the engine at startup. If it's not functioning properly, it can cause a rough idle. I would recommend getting this checked out by a mechanic as well.