My "new" 3.0 OM603 is back in operation and everything seems good with one exception- once the engine is warmed up, the idle hunts. From a cold start, it idles smooth and steady for about 3 minutes. At this point it starts to cycle predictably between appro. 750-800 rpm, non-stop. We static timed the IP, and I have a request in to rent the A-B lights from a member here. Vacuum lines are all connected accurately according to the diagram. Any thoughts?

Thanks!

__________________
Chief

1991 350SD