A going bad fuel pump and a old fuel filter can make it do that, or maybe an idle problem that needs to be adjusted. Also, you could pick up a bottle of stp fuel injector cleaner, it might help and it only cost about 3 to 5 dollars. Then also some of the things "e3NiNe" said.

Well i have a 93 and the air gets in the front driver, and both back windows. I never recognize it anymore because my music is always turned up. So that will save you a couple dollars fixing that, just get the new speakers and turn it up.

Also when buying speakers for any car you have to check the specs of the speaker to make sure it fits (usaly you find these at the web site or on the box itself). Bigger magnets don't mean better sound, just keep that in mind. Anouther thing, the honda factory headunit seems to be real good, but if your speakers end up not sounding good it because of the headunit. (recomended speakers and headunits: Kenwood, alpine, Infinity, only some pioneer, and of course the high end "rockford fosgate who also makes regular speakers too, not just subs").