My 2001 lincoln navigator chugs and acts like it will die at stop lights. Idle speed drops and jumps it doesn't do this all the time but at leat 1 out of four stop lights it will. Also the oil warning light comes on and oil level gauge shows nothing (empty) then 30 seconds or so goes away and acts normal. Wife just called Navigator died at a stop light on her. It always starts right up again thankfully. Replaced the IOC valve