4.6 Dinan Idle issues

[schwaggen]

Did a search, couldn't find a thread that describes the same issue. Comes and goes, but sometimes, the car either doesn't WANT to idle (Starts, cranks over, and then dies) or idles very irregularly (surges, falls, sometimes dies at a red light).

More usually, it happens when there is no load, in P or Neutral. It will happen as you coast to a stop at a light. If it just sits and idles, it will surge, and fall, and sometimes die. Mechanics have searched for a vacuum leak (which was my first theory) and found nothing. Wondering if there's an idle sensor of some sort? This is the ONLY issue with an otherwise awesome car. Any suggestions much appreciated.