Warning Light On problems of the 1998 Hyundai Tiburon

The car has been into Hyundai dealers 4 times since I've owned it. I am the original owner. Car has been in literally every other month since purchase in October 1998. Major problem has to do with the computer(s) and transmission. Check engine warning light, airbag warning light have both gone off. Car wouldn't shift and would hesitate at highway and side street speeds. Car just returned from dealer yesterday after 4th time in for repair. At 65 mph, the rpms suddenly shot to approx 5800. Car has been terribly unreliable. Hopefully it is fixed now, but I am filing this complaint because I fear that in another 2 months the problems will occur again.