Hey guys new to the honda game and my b20 is idling at 1500 rpms. I checked for any vacuum leaks and I don't see any this happened after I change the iacv. What can it be?

 

If it's happening when you first start up the car it is completely normal. The idle will lower as the car warms up. The iacv normally has filters that prevent vacuum leaks where it attaches to the intake manifold. You may have dropped them.