90 Model civic the engine is d16a6.

I took another IAC valve off of another civic with the same motord 16a6 and it still does it.

I'm lost anything I am missing that I need to replace also. Do I need to adjust the throttle screw?

Any help will be greatly appriciated.

 

Try adjusting the idle screw. Also check your vacuum lines.

 

Any specific lines or all of them?

 

All your vacumm lines. Make sure they are plugged in.

 

Maybe you got some air in your cooling system.
Check vacuum lines.

 

For me it wasnt that the vacum lines werent connected good, but that they werent connected properly. A few were switched around

Get a chart and make surere there all doen properly

 

is the check engine light on?

 

did you reset the ecu?

if you dont reset the ecu it'll have a fit about that ****

 

How do you reset the ECU?

 

Disconnect the battery or take out the fuse...**** I forget which one...

 

remove hazard fuse under the hood for 30 second or so to reset ecu.

 

I will reset the ECU and check all vacume lines. thanks for all the reply's.

 

Its probably the fast idle air control valve, its located under the throttle body. There is a right up on here about how to clean it out, basically inside there is a spring and a cap type thing, well it gets stuck open sometimes and you need to clean it.