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Gaducker,
An uneducated guess would be that you may have a high pressure oil pump draining down while sitting for long periods of time. When you start it, air is introduced to the system, and takes a while to work its way out of the system. Just replaced the IPR on my '97, and it ran horrible. I increased the idle speed to about 1500 rpm's for several minutes and when I allowed the engine ot return to normal idle, it sounded much better.
After driving approximately 10 miles, it runs just like it did before, which is very smooth for a diesel.
Weazer
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1997 F250 4X4 133K LONG BED/STANDARD CAB 5 SPEED. TYMAR INTAKE/DIAMOND EYE 4" EXHAUST
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