The 1990 Champion Spark Plug 400 was a Winston Cup Series (now Nextel Cup) event held at Michigan International Speedway on August 19, 1990. Mark Martin led 72 of 200 laps in route to victory, holding off Greg Sacks by 1.7 seconds. Martin also was in charge of the points lead, holding a 48-point edge on Dale Earnhardt (6th).
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