[fabiano]

Yesterday, while sitting at a red light, the idle on my S2 went real low, almost stalled and then began to pulse from about 400 to 900 RPM. It stopped when I pulled out and ran fine at speed. No miss or anything, just as smooth as always. Since then it has done the same thing at least 5 times. Other times it idles just fine. It seems to happen when the car is warm, not cold. Any ideas where to start looking?

Thanks!