The first thing you need to do, is speak to the dealer you bought it from.
Since it is far away, you need to decide if you want the added hassle of taking it back to them, or getting them to retrieve the vehicle. How long have you had it for?
FSI's have a lot of sensors on the engine and can throw codes if anything is not doing what it is supposed to.
How slow is slow? Is it in limp home mode (struggles to hit 50mph), or is it sluggish, or juddering?
A diagnostic scan will help pinpoint what is wrong, do you have AA membership (or similar) they will scan vehicles now and it can be the easiest option to help you with your issue.