Help 07 M8 won't restart

I went and started my M8 yesterday to pull it out of the trailer, it started hard because it was about 0*F but ran fine. After it warmed up I went to rev it up to turn the track and it died, now even after sitting in the heated shop over night it still won't start. I do have good spark and the fuel pump seems to pump good (ran it backwards and forward). I also checked and have power to the injectors. Trying to take the fuel rail off now and check injectors but the screws that hold it on will not budge. Any help is appreciated.

Thanks