I have the same issue, ever since I did my last valve adjustment. Ive checked and then triple checked everything since, and its all within spec.

I think it might have something to do with the fuel, as when I added a heavy dose of redline, it went away. But typically it resembles how it would start on a cold day, after sitting for a long time; and similarly, if I press the pedal ever so slightly, it starts perfectly.

Its very annoying, rather intermittent, and I wish it wouldnt be like this.

I hope for suggestions,

Thanks,

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)