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The early C4's had their problems, what with the 1984 Cross-Fire Injection and its unusual 4+3 manual transmission. By the late 1980's, the fourth-generation Corvette had evolved into a more desirable automobile, thanks in part to the arrival of the ZR-1. 
1991 Corvette
Overall, sales of the 1991 Chevy Corvette followed the downward trend started earlier in the model year by the ZR-1. In all, 20,639 units were sold, with coupes outselling convertibles at a ratio of about three-to-one
1989 Corvette
For the first time in several years, the 1989 model year would actually see an increase in the total sales numbers of the Chevrolet Corvette. Chevrolet sold a total of 26,412 Corvettes in 1989.