Re: Does anyone know a good diesel mechanic?
Is this a new development? I would suspect an injector is acting up. I would get it running, then slow the motor down as much as possible so it keeps running then I would crack injector lines at the injector which should cause a noticeable drop in RPM and increased roughness. If it doesn't, you've at least narrowed the problem down to one cylinder. I suspect it runs rough at higher speed too, but the higher RPM just makes it harder to tell. That's my first guess with the limited info.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.