This is on a 2001 Taurus with a 3.0L. When I come to a stop light sometimes or through the McDonalds drive thru, the engine will start vibrating pretty bad and the rpms dip down to 500-600 rpms and go up and down. Also, you can smell burning oil when the vent is on when you are sitting still. I don't know whats goin on with the car. It has 132,000 miles on it. Thanks for any help.