Odd engine surge at idle right after start.
I was out running errands today, and twice, when I got back in my car and started it, (transmission in Park) after about a second or two the (normal) gargling noise from my K&N intake started to get louder and the engine RPM started to increase, getting up to about maybe 3000 over the course of a couple seconds, then it went back to normal idle and was fine. Next time I stopped for another errand, it did the same thing when I started it again.
Anyone ever have that happen before? Ideas?