can anyone tell me what can make the IACV go bad? and the how to correct them

 

take it apart and clean it all out and then reinstall it. if your idle is still messed up it's probably the motor in there, just get a new one.

if this is in reference to bad idle, try to clean out and readjust the FITV also.

 

if this is in reference to bad idle, try to clean out and readjust the FITV also. [/QUOTE]

whats the FITV

 

What's wrong with your IACV? Is your ECU setting a code for the IACV?