He is the current record holder of the world's fastest Sprint Car race at a United States Auto Club event in Phoenix, Arizona at 136.034 mph 1996.

Michner finished twice a runner-up to NASCAR'S Tony Stewart in United States Auto Club competition and has 19 USAC Wins.

In 1996 & 1997, Michner ran a partial season in the NASCAR Craftsman Truck Series as Chevrolet's Development Driver.

At Michigan International Speedway in August 1998, it was announced, Michner signed a 3-year contract to drive the Bayer Aleve, Coca-Cola Chevrolet in NASCAR's Busch Series for BACE Motorsports.

He attempted to qualify for the 1999 Indianapolis 500 for Byrd Racing but failed to make the field due to rain.