hello everyone I'm new here, and this is my first ford diesel its a E450 with 21600 miles, I ve been reading a lot here and cant seem to find anything that relates to my problem exactly, rough idle, and very low power at start up, as soon as you get a mile down the road, it clears up, and doesn't have a problem the rest of the day, but this happens almost every day it does have a pretty good oil leak it has a new hpop new glow plugs and controller the previous owner has done a little work to it, and has told me it needs a new IDM any advice and all help is appreciated