I can't recommend replacing parts when dealing with an intermittent problem.
I might as well tell you to buy new wiper blades.
This is why I'm leaning towards the evap system.
A short time after you start the car. The valve opens to purge the canister.
Making a controlled vacuum leak of sorts.
The computer is expecting the leak and shuts the IAC a little bit to keep the idle from going high.
If the charcoal canister is saturated or the valve doesn't open, then the extra air doesn't get sucked in to the engine so idle drops.
That's my best guess.
I know intermittent things are frustrating. You can do something and think it's fixed only to have it happen again a week later.
Tuesday, December 9th, 2008 AT 12:43 PM