95 talon probley

[GsXtUrBo98]

My gf has a 95 tsi awd auto it has 14b, knock off bov otherwise stock.It was running fine, but the other day she came home and heard a bang. The car wouldnt go over 15 mph. I went out to start it but wouldnt idle.. Heard exhaust leak coming from the front of engine. I then pulled off piping and checked the turbo but no play. The exhaust bolts off the o2 housing were lose so i checked the gasket and it was good so i tightend them back up. Started the car it ran for 2 sec then it died, started again and reved up but it started to miss but then it would idle... Revved up to 3500 held for a sec and it missed bad. Any help would surely be appreciated!!!!!