i cant figure out whats wrong with this thing. after the car warms up, the idle will go from around 2000, drop down to about 900-1000 and then go back to around 2000 and it will continually do this. after i installed the manifold, i didnt have an intake that worked, so i just ran it without one, but this has only started since i put the cold air on that i got. there are no vacuum leaks that i can find, the ecu has been reset, and im just out of ideas. anyone have any thoughts?

Adam

 

you probably got your IACV dirty when you swaped it over...its on the back of the manifold with coolant lines running to it...take it off and clean it out

 

That's what happened to me, and that's what I did and problem solved I used sensor safe carb cleaner.

 

if it happens when the car warms up, you might have air in the cooling system. i've seen an accord do that after installing a water pump. once we burped the cooling system the idle returned to normal.