[DDFII]

Last week the motor would idle rough. Wait a few minutes and it would smooth out. I left a job and the motor idled rough and ran rough, couldn't get up to speed. Lose of power and lots of white smoke. Couldn't get over twenty mph. Mile down the road it smooth out again. Checked the wiring harnesses under the valve covers (ok). No visible leaks. Check engine light came on briefly , no codes to be found. The white smoke issue one week later seems to be gone. Disconnected the ops and the motor & it smooth itself out, not perfectly. Grasping for straws need help!! ( I'm a novice when it comes to diesels).