I have a 90 honda civic 1.5 4sp

When i run my car a few miles and come to a stoping point my car idles funny.
It will idle high and low constently. like a 200-300 rpm increase drop to normal and idle high again.
any ideas on what it could be?

 

Try looking at the faq at the top of the crx forum for that one. You will find many troubleshooting tips there. This is the link.

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/how-fix-your-idleing-woes-fitv-iacv-2153910/