"Driving Miss Daisy" continues to race along in high gear, too fast for the competition. "Born on the Fourth of July" may die in the No. 2 slot. It doesn't seem to have the power to catch "Miss Daisy" and may start slipping down the chart without ever savoring the top spot. If MCA/Universal had released it at any other time--to avoid direct competition with "Miss Daisy"--then "Born" would certainly have reached No. 1. That sentimental soaper "Stella," featuring Bette Midler, is doing surprisingly well--No. 4--in the rental market for a movie that had a so-so ($20 million) box-office run. "Impulse," a violent drama starring Theresa Russell as a cop with questionable scruples, debuted at No. 27 and could be a sleeper rental hit.