Greg Biffle finished fourth on Sunday, but you would never have known it from the grim look on his face.

The Bif, a strong contender through much of the race, was running second to Jeff Gordon when he made a costly mistake on his last pit stop. He slid his No. 16 Ford across his own air hose as he entered his pit box and NASCAR immediately penalized Biffle, pushing him back to 12th place.

Biffle was a man on a mission after that, moving all the way to fourth before running out of laps.

“They should fire me,” he said immediately after getting out of his car. “That was a pretty fast car. I just screwed it up trying to get greedy.

“You know it was so hard to pass out here, and I was hoping to beat the 24 (Gordon) out and I was trying to give my guys every advantage I could. … We had this problem before. It’s just me stopping too deep in the box and caught them off guard and ran over the hose.

“They didn’t do anything wrong,” he added. “It was my fault.”

Biffle said he was knew he was going to have trouble sleeping Sunday night.

“I’m just sick to my stomach, man,” he said. “It almost brings tears to my eyes to know I let my guys down like I did.”

But it wasn’t all that bad a day for Biffle, who added Sunday’s top-five finish to a far more disappointing 20th-place finish in the Daytona 500. He was one of three Roush Fenway Racing entries to finish in the top 10, joining winner Matt Kenseth and seventh-place Carl Edwards. The other two team drivers, Jamie McMurray and David Ragan, finished 16th and 17th.

Hookscenter.com wire report.