I got a 91 prelude Si, and it starts up kinda rough too. Especially when it's been cold and there's a lot of condensation or water. When I crank it, it'll give you one of those old jalopy car "Errrk Errk Errk Erkk, kapruh.. kapruh... kapruh VROOOMMM" starts. But once the engine gets started up for the day and warmed up, the next time I start it up it's fine, like a "click VROOM".
I've also been having oil leaks and such which I've been getting fixed (oil pressure sensor, oil pan gasket, crank shaft seal, cam shaft seals, and some other stuff...).
Worries me since it's been getting worse lately, but I blame the weather.