Hello all, I am the proud owner of a new to me 300D and over the last few weeks I have been going through the car and doing maintenance.

I am new to diesels so I was hoping for some help troubleshooting when I first start it is cold it idles rough but if I give some slight gas it smooths out....

How can I determine if it's the glow plugs or injectors, etc? I cleaned the engine bay and noticed no diesel leaks so far....