recommended maintenance for TT
 

I bought a 2008 Audi TT turbo convertible 6 years ago. This is my first Audi. It had about 25,000 miles. I`ve put about 12,000 on it in 6 years. It`s idling a little strange sometimes and I`m going to get it checked soon. I haven`t had to or done any maintenance on it since I`ve had it. I change the oil every year but nothing else.

Does anyone recommend any basic maintenance for it?