Baltimore Ravens quarterback Steve McNair missed his second consecutive day of practice Friday with a stiff back, and the team will make a decision at game time Sunday whether he will play against the St. Louis Rams. Backup quarterback Kyle Boller took all the snaps again Friday with the first-team offense. McNair missed the second game of the season with a groin pull that has hampered him since the season opener in Cincinnati. "It's just tightened up," Ravens coach Brian Billick said of McNair's back. "I'm not sure the groin didn't lead to some tightness in the back. We'll have to see how he feels at the end of the day today, Saturday and Sunday -- game-time decision."