hey guys ok well im having some prob with my idle its a 99 civic ex. When i start my car it idles over 1000 rpm then as i start driving and i come to a stop my idle drops to like 100 like it is barely above the 0 line. tune up time?

any help will be good thanks

 

check engine light?
if it's due for any maintenance,it certainly couldn't hurt.
chris

 

this seems to be a common problem lately, i have been dealing with this for several months now trying to figure it out, i have since cleaned the iacv, replaced the alternator, and done a full tune up, with minimal changes, my future plans are to do a valve adjustment and most likely buy a brand new iacv and see where that gets me

 

clean out your throttle body also.

 

maybe I am wrong but I am pretty sure that that line right above the 0 line is 500 rpm not 100. so for a stock civic engine where idle is supposed to be like 650 I wouldn't worry about it unless the idle is rough. you could just adjust it.

but as I said I could be wrong and it never hurts to clean out ur IACV and ur throttle body.