B18a1 in 90 hatch idle problems

[fixed4 life]

I just swapped a B18a1 into my 90 hatch. When i turn it on in the mornings it idles high 3000 rpms. After it warms up it idles up and down between 1000 and 2000 rpms i am using a 91 integra ecu. The ecu is not throwing any codes so unsure what it is i have checked my vaccum lines they seem to be ok. Any help would be appreciated.

 

[boostin4fun]

I would check out your idle air control valve. It is located on your intake manifold. I would take it off and make sure the screen on it is clean, and that it is functioning correctly.

 

[ef9davejdm]

either throttle body is shot and is leaking air out enourmously or ur heating core is bad go have them checked out i had the same problem swapping a b18a1 a while ago but i had a bad Throttle body lawl...but pay someone to check it out or if you know enough you do it...

 

[fixed4 life]

I finally figured out the problem it was the PCV valve