In 1980, Comer came into the season in the rotation, but he started the year on a negative note, losing three of his first four decisions with an ERA around 10.00 when he was sidelined due to a shoulder injury.

In 1981, his shoulder was healed, and Comer was a vital part of the Rangers bullpen, pitching in 36 games, finishing 22 of them, and earning 6 saves, tying him with Charlie Hough for the team lead.

Philadelphia would lose the World Series that year, though Comer was a non-factor in the postseason, not appearing on their roster.

Comer would wrap up his Major League career in 1984 with the Indians, for whom he went 4-8 with an ERA of 5.68 in 22 games, 20 of them starts.

On November 3, 1979 in Hennepin County, Minnesota, Steve married Kathy Lynn Gatz (b. January 10, 1955).