Have you modified your intake?
I used to have a CAI and my idle would run like shit. As a matter of fact, I couldn't even use my AC while at a stop because the car would die. I have since put the stock airbox back on and the idle is smooth as the day I bought it. No problems with the AC now. Quite honestly, I don't see any decrease in performance either, and I don't miss the loud growl that I would get when I stepped on the gas (I'm over that now). However, I'm also using a mixture of E85 ethanol and 87 octane for fuel and even though I don't get the gas mileage I did before, the car runs far better than it did using Premium. The punch off the line feels just the same as when I had the CAI if not better.
I had to remove the CAI as the CARB sticker was for an Eclipse GT and wouldn't pass smog. But since having going back to the stock airbox, I don't really miss the CAI.
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