Ok here we go. I have an EG with a JDM H22 swap.
When the engine is cold in the mornings or when it hasnt been running for a long period of time through out the day the idle jumps. When I first start the car the idle jumps up and down until the engine warms up then the idle is fine. Has anyone come accross this problem? Please Help !!!!!!

 

search for idle air control valve, iacv or fitv fast idle thermal valve

 

Have someone inspect your ECU as well. Maybe it needs to be tuned just a little. I have a question for you though. I just bought a 2000 Si from a guy 9 days ago and the B16A2 froze up on me. There was no Oil in the engine. It is being checked out as to why there is no oil. I am thinking of dropping in an H22A and am inquiring to see if you had to remove your A/C or any other vital components? Was it easy....let me know....and thanks.

 

I removed the A/C but should be able to keep it with alittle mod.