I have a slight crack on the top of the radiator. Gonna get a Fluidyne soon once I get some funds. Could that little tiny crack cause for the Idle to be funny? Cause when the car is cold, the idle drops like a rock from 1500 to like almost stalling out then jumps back up. And doesn't keep on happening, just like maybe every 30 seconds or something.

 

i had exactly the same thing happen to my corolla whenever the water level was low... integra didn't do it though.