2006 Audi A3 2.0t sportback problem
 

No matter what gear I am in, when I accelerate the car doesn't do much of anything other than go at a snails pace. I can't even get it to 60mph. Any possible help? I will update later on with the list of things that have been cleared as okay (been replaced already).

It's really frustrating as this is such a nice car, I just want to feel like I have some sort of power in it. Any and all help is appreciated, thanks!