first of all, your car is older, best thing you can do if you know it hasn't been done is change you plugs. I'm not sure what are the best kind, i'm using bosch platinum +4, although i heard they aren't the best i don't have a problem with them. Next change you oil if you know it hasn't been done. Plug wires are a plus too although not totally nescessary. I heard that Nology makes a nasty set that contains capacitors in them.
Although doing this stuff isn't going to do anything tremendous, it may make your car run a little smoother. And for the spring issues, see if you still have your stock struts, if you do you probably need new ones and if not then just redo the whole setup (ie: work you ass off and buy a nice suspension set-up, or go to the junkyard)
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