89 Prelude Rough Idle, engine dies

Please help!

I have an 89 Prelude 2.0 S with stock engine (173 K miles). The car idles roughly and dies when I stop the car at a stop light. It runs great on the freeway. The idle is still rough, but it does not die when it gets warmed up. The check engine light comes on after a while, but goes out when the engine is turned off. I used fuel additives and gave it a tune up, as well as having the carbs cleaned and adjusted. The car has sat around for a while before I bought it.

Are there any aftermarket intakes and carbs available? Maybe a single two bbl carb instead of two ibbl carbs. I would also like to know where to get other parts for the car (rear wing, cover for the clock, replacement trim parts on dash and windshield washer that have warped because of heat).

Thanks a lot!