Labonte ran his first full season 1990, with sponsorship from Penrose Firecracker. Although he went winless, he had seventeen top-tens and finished fourth in the final standings. In 1991, he won two races and the Busch Series championship. That same season, Labonte Motorsports, ran five races at the Winston Cup level. Bobby ran two races for Bob, first in the 14, and then the 44, dropping out of both races with engine failure. Irv Hoerr then ran three races for Terry in the 44, his best finish being 19th at Pocono Raceway. Terry also began fielding his own entries in Busch, driving five races in the No. 94 Sunoco Oldsmobile and picking up a win at Watkins Glen International. In 1992, Labonte won three races but lost the championship by three points. Terry failed to win a race, but switched to the No. 14 after picking up sponsorship from MW Windows.