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Stewart was 16th at the Daytona 500 and had a good finish ruined last week at Phoenix after he turned off his car to save on fuel and couldn't get it to re-fire, a problem believed to be linked to NASCAR's new electronic fuel injection system. He was well back in the pack after a lengthy pit stop and finished 22nd.
Stewart qualified seventh at Las Vegas and took his first lead on lap 135, beating Johnson on a restart. He lost the lead briefly on a cycle of green-flag pit stops and quickly regained it.
He turned back a challenge by Keselowski and pulled away from Johnson on a final restart with four laps left to finally take the checkers, leaving Darlington and Kentucky as the only active tracks he hasn't won at.
"I really believe Tony is really coming into his own with Stewart-Haas Racing," co-owner Gene Haas said. "He's as calm as I've ever seen him, composed, very confident in what he does. I have no doubt this could be another pivotal year for Tony."
Johnson had to break out a backup car after a crash in practice on Saturday, sending him to the back of the field. He didn't take long to get to the front, though, challenging Matt Kenseth for the lead by lap 83.
Johnson, who has never won in a backup car, overtook Kenseth 16 laps later and stayed there until Stewart beat him on a restart on lap 134. The five-time Sprint Cup champion stayed within range and was third coming out of a caution with 17 laps, then quickly passed Biffle for second.
Two more cautions caused by the Busch brothers followed, but Johnson couldn't keep up with Stewart on the restarts.
"I drove my guts out, but just didn't get it done," Johnson said.
Dale Earnhardt Jr. dominated the early part of the race, leading 70 of the first 73 laps -- 18 more than he had in all of 2011. He dropped back after taking four tires while nearly else took two during a caution on lap 74 and struggled with his car in traffic after that, finishing 10th to extend his winless streak to 132 races.
[Associated Press;
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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