1983 240D

It has been starting OK, but for the first few minutes it runs really rough and sometimes stalls. I thought it might be the glow plugs, so I just changed the glow plugs. They all had a heavy coat of carbon on the tips.

I also changed the clear fuel pre-filter. It seemd to have a few particles in it.

I installed new injectors about 6 months ago.

Any suggestions about the running rough?

Is the carbon on the glow plugs significant?

This has been a great source of information and I really appreciate the help.

Thanks.