Well how many miles does your 1991 teg have and what are the problems that you have with it???
If the repairs cost more than the worth of the car I say you should sell it/part it out and get what you can for it and put the money towards something a little more expensive but more reliable. With $5k you can get a decent teg. I assume you're looking for an ls? Manual/AT?
You probably get a decent 96-97 ls for $5k. Of course, just like any pre-owned car you'll probably spend a little money tuning it up (filters,oil,plugs,etc....) After the tune-up given the fact that it's in good condition should last you a long time.