hit up home depot and make yourself an intake. I had a 89 and there was zero aftermarket out of the box parts for it. (even the k&n drop on that was listed for the car didnt fit- it fit but the holes didnt line up). other than that, a full tune up, exhaust if you got the $$. if you really want to go all out swap in a b series motor.

even a strait b20b froma CRV or b18 from a 90+teg will make that car fly. I miss my old teg, its really light so you dont need as much hp to make it quick