First thing, the
tranny, those fail, and more so in the heavier convertibles.
Then check the suspension, after all this time is it possible you need to replace the tie rods, and possibly some bushings.
The engine is reliable, but might need a good tuneup.
Another issue is COOLING, those years are prone to overheat, the radiator is on the small side and if not cleaned often the passages block and car overheats. The fan also had problems, there even was a recall on the wiring, make sure it works.
Other than that, it is a 5.0, and as such very reliable.