i have a 99 crv that when i drive it and then put it in park, the idle will surge from 1k-2k for 2-7 seconds and then go back to normal. only does it in park, after being driven. doesnt really effect anything, no cel and it passed i/m like that just wondering if anyone has any ideas on what the cause might be. cleaned the iac and also checked and found no vacuum leaks.

 

sometimes your sensors about the air box can be dirty and confuse the ecu, try cleaning them up, even try cleaning your o2 sensors by removing them and boiling them in a 20/80 lime away water solution

 

did you ever figure out your problem, i am having the same issue?

 

start by cleaning your Idle air control sylinoid, and the throttle body as well. If it's an auto there is also this thing on the bottom of the TB that needs to be taken apart, and there is a screw inside it that might be loose, and need tobe retightened.

BTW get your valves adjusted ASAP, they need to be done every 30k!