The finishes seem implausible, especially because they've come in succession - 42nd place at Daytona, 42nd at New Hampshire, a brief improvement to 14th at the Brickyard, followed by a dip to 39th at Pocono and 28th at Watkins Glen. This is Jimmie Johnson, NASCAR's six-time Sprint Cup champion? The latest setback came Friday when Johnson finished 30th in qualifying at Michigan International Speedway, complaining afterward about a vibrating car. Johnson won at MIS earlier this season - his third victory in four races at the time - but based on his recent form, a repeat isn't looking especially likely in Sunday's Cup race. More...