Recently my Audi (2001,A4, 1.8T,65,000 miles) has been having problems. It just shuts off in the middle of my driving.
I went to Autozone this morning for a code diagnosis/troubleshooting and they gave me these codes:

P0130
P0171

Can someone please tell me what they mean or what may be wrong with my car?
How much would it approx cost to repair? Can I take it to the dealer for repair?
I suspect it is a bad MAF and/or a dirty throttle body. Someone suggested a vacuum leak.
Please advise.