I'm having idling issues on startup. I can't seem to figure it out. The car runs great after it warms up, yes, AFTER it's warm. As soon as you let it sit long enough to cool down and start it back up, it starts that crazy idling up and down, up and down, up and down! Driving me nuts. Already replaced the IACV. Nothing. It has an Injen cold air intake. The car is super fast, but this is so annoying. Help?