1999 Civic LX with a D16Z6 1.6L vtec

When I first start it up, it will be around 1100-1400 rpm for a minute and drop to rough idle about 500 rpm if not less, I press the gas and get it about 2500 rpm (trying hard not to press real hard)

After a minute or so after that, if I turn off the engine and turn it over again it will be fine.

I'm thinking it's the idle air control or a vacuum leak. There is a sound that sounds like a vacuum leak near the cold air intake pipe.

Any advice would be appreciated. I'm new to Honda's.

 

If you can hear what sounds like a vacuum leak...that is probably the awnser to your idle issue. Never hurts to clean the iacv w/ some brake cleaner anyhow. They like to fill up w/ carbon. I do mine every month or 2 as my high(er) compression motor produces more carbon.

 

I have the same problem too. Let me know what you end up doing.

 

It gets worse than this, but this is what it does (when the RPMs drop too where it's going to stall)

https://www.youtube.com/watch?v=WzPvmE7Ppe8