CONCORD, N.C.—Jimmie Johnson could only look at his car Thursday, spending most of the afternoon eating junk food in his team’s hauler and watching it rain.

Before nightfall, the Sprint Cup points leader had been awarded more treats—the pole, the first pit stall, and likely five points for leading the first lap—for the Bank of America 500 on Saturday night.

Johnson hopes the gift will help him regain his dominance at Lowe’s Motor Speedway.

The steady drizzle that first canceled the afternoon practice session didn’t subside, and NASCAR called off qualifying 9...

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