In the 1990 Pepsi 400 practice Marcis crashed into Darrell Waltrip's car. Both were injured in the crash and Waltrip missed six races. Marcis' car was destroyed and they did not have a backup, so they made a partnership to run J. D. McDuffie's Pontiac when McDuffie failed to qualify. Since Marcis was injured he was replaced in the first laps of the race by McDuffie as a relief driver but since Marcis started the race he was credited with the 20th-place finish.