Check your FPC...it powers the fuel pump.. On a TT they go out in a flash.. it's behind the drivers seat. Have to pull the carpet. Once you've pulled it out take the covers off and see if anything is burnt inside of it.. IF so it's shot...you'll need another... New cost over $250
Nistune Dealer Built Automatics -ECU socketing ECU eprom upgrades WWW.AAA-HiperformanceAuto.com