Over the past couple of weeks a couple of things happened and I figured something out this morning. I started the Jetta (2001 VR6) this morning and the coolant alarm came on. Added coolant, second time in last couple weeks and the car runs rough when low RPM (feels like its missing) but get up to speed and everything runs normal. First thing I thought after those two things happened was head gasket. Stopped and checked under oil cap and it was the chocolate milk look. So there is coolant/moisture getting into the oil. What are the possible causes? The car has not overheated, it runs at the normal temperature. I use the VW coolant. Whats up?