It is spring here in North Carolina, so not very cold. My car starts fine. Glow plugs are new. But has a very rough idle now upon starting. I use diesel fuel treatment every fillup. I purged with Lubro moly about 6 months ago. I rev the engine a little and it will finally smooth out.

Should I purge again or is it time to rebulid injectors?
260k miles

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup