Kolb shaky in his debut for Bills

After not playing in the preseason opener, Kevin Kolb got back into the Buffalo Bills' quarterback competition on Friday night, starting and playing the entire first half against the Minnesota Vikings.

Kolb's results were mixed. He finished the first half 13-of-21 passing for 111 yards, but many of his completions came on check-downs to tight ends and running backs. Kolb also scrambled out of the pocket frequently, often throwing on the run.

The Bills were 2-for-9 on third down, and at one point in the second quarter Kolb was booed by some fans at Ralph Wilson Stadium after his pass to wide receiver Chris Hogan on third-and-8 fell incomplete.

Kolb also threw an interception in the first quarter, although his pass, intended for rookie receiver Marquise Goodwin along the sideline, was tipped by the defender in coverage before it was caught by Vikings safety Jamarca Sanford.

Late in the first half, Kolb began to look stronger, leading the Bills on a 13-play drive that was stunted in the red zone by a holding penalty on guard Colin Brown. But Buffalo was forced to punt after Kolb couldn't connect with running back Tashard Choice on third-and-12.

After the Bills regained possession with 38 seconds left in the half, Kolb had his best drive of the game, completing back-to-back passes to push the Bills into field-goal range.

Kolb finished the first half with a 55.9 quarterback rating. He was replaced by rookie EJ Manuel at the start of the second half.