Markymidnite

hey everyone, so i had taken my injectors out to replace the o rings cuz i was looking like it was leaking... so all was well but i was doing a bunch of stuff at once and forgot to put one of the 2 bolts holding the fuel rain down back in..
so today one of the injectors got loose and was leaking and i realized i hadnt put the bolt back in... so i took everything out and re did it all so all the injectors were seated but now it wont start !! it just cranks, i got it to start for a second and then died.. its getting fuel and if i press the schrader valve in i can hear air so its getting pressure... this makes no sense!?? what could be wrong?
im lost and the car is stuck at my work so i really need to get it started.. any ideas of what it could be? everything was fine and running great up til this happened.. thank you for any help i really appreciate it..

2003 audi a4 1.8 turbo,