Audi Quattro Engine Revs Up

Having Just Spent $7000 To Put In A New Engine, I'm Almost Sick Asking This Question! So Out Of The Blue My Audi Tt Started Making A...

I Have An Audi 2.3 20v Quattro And When I Accelarate The Car Wont Go Past 3500/4000 Rpm Feels Like Brakes Are On Or Its Being Held Back...