Driving home in the 04 Jetta(mileage 173k miles) when I exited the freeway. Made the turn off of off ramp with normal running conditions and as I approached intersection noticed,felt and hear what seemed as a release of boost. I rolled to the stop light and made a right turn and immediately noticed a huge lack of boost.. it then stopped running. I tried to restart which it did but idles rough then turned itself off. Any ideas of where to start looking? I know I need it Vag to check codes. Thanks for any info.