Hey guys, I'm new to this forum. Today I got a 92 Prelude Si from my sister (free is the best price

), and it has a strange problem. Whenever the car is idling, it will idle up to about 2000, and then suddenly drop down to about 800, and it does this over and over until you add throttle. Is this a common problem in these cars? I believe it is the 2.3. Any help would be appreciated.