Originally Posted by alsevi

The glow plug light and code warrant replacement to address difficult to start. Not sure if they are related to idle then die. If you have not done this before, research here how to check for defective plugs prior to removal. The relay may be malfunctioning and not powering a plug(s). In any case, research the valuable information here on plug removal. There is a risk of breakage in place which changes the scope of work significantly.