What can Cause rough idle? sounds more like dieseling or pre-ignition run on.

What is your question?

60,000 miles newly purchased. This has occurred twice now when not moving. Drive or Nuetral or Park does not change issue. Reving engine or stopping and restarting engine seem to have resolved it both times, however I am extremely concerned about the knocking and/or dieseling sounds as it seems this would tear the engine apart over time. Oil is clean and none burnt since last 1000+ miles of highway driving. No Check Engine or diagnostic lights and vehicle health report says engine is fine. Any suggestions appreciated as my big bank loan is looming(not made first payment yet) and I am very nervous about longevity of this vehicle.