My wife's 2009 corolla has an issue when it is cold outside, 40 F or below. When you come to a stop and push in the clutch the engine almost stalls. The RPMs drop to about 400 and we have a little vibration like it is going to stall then it comes right back up to 800 RPM and it is fine. It is still under warranty but the dealership was not able to duplicate it, of course. Our dealer where we lived before replaced the water pump last year and thought they fixed it. but now that it is cold out again it is back.
Anyone have any ideas?