I've replaced both filters with MB filters. The fuel lines appear to be in good condition, but a pin hole would not be visible. Because the fuel lines on the banjo fittings are so dark, I cannot see if there is any air, just the occassional hiccup at idle when first starting it. This vehicle only has 94K miles. I still want to check chain stretch and injection timing. Currently I'm working on a design for a diesel timing light. That would make the injection timing much easier. We'll see! Thanks for the info, but I think the problem might be air getting into the fuel lines when it has sat over night. What ideas might anyone have to discount this theory? All ideas are welcome.

Best regards,