ST. LOUIS—Even on the road, the chorus of “Romo!, Romo!” from Dallas Cowboys’ fans was easily audible at the start of the second half.

Tony Romo told the coaching staff after pregame warmups he wasn’t up to playing with a broken right pinkie. He was in uniform, giving fans false hope, but they were stuck with Brad Johnson.

The 40-year-old backup quarterback couldn’t keep up with a suddenly potent, opportunistic St. Louis Rams’ offense, throwing three interceptions. Steven Jackson ran for 160 yards on 25 carries with three touchdowns and the Rams (2-4) looked like conten...

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