i been having this problem for several months my car idles fine till about the car warms up drops to about 500 rpms ans jumps to like 1000 i replaced iac valve just today becuase i thought that was it but it seems that it isnt can some one help me out im tired of wasting money could it possibly be the map sensor

 

http://www.ef-honda.com/ben/Badidle.php

Hey i have been having the same problem, I'm gonna be working on it today.

since you replaced the IACV already i would check the FITV. Also you may want to flush your coolant, sometimes bubbles in the coolant will cause the FITV to freak-out.

I will let you know if i get the issue resolved.

 

i have the same problem, it could be a vacuum leak, i replaced my hoses and it all goo now, try that

 

TRY TO ADJUST THE LITTLE SCREW ABOVE THE THROTTLE BODY

 

thanks a lot helped out alot

 

if it keeps doing it, check and see if you have a vac. leak by, taking off you intake pipe. and starting your car, cover the TB with your hand, if the car turns off then you don't have a leak, if you car keeps running then you have a leak, just fallow the nosie and you'll find it good luck man