If fuel supply to the injection pump is OK, it may be a sticking metering valve, or sticking plungers. Idle speed should be 800 RPM, if lower set it back up and see if that helps. With the engine at 2000 RPM or more, and the throttle brought back to idle quickly does the engine die or under run idle speed, then come back up a bit? If so that's the metering valve sticking. More common is the retainer ring is breaking apart inside, then when housing pressure rises equal to transfer pressure the plungers no longer move during the charging cycle, and fuel delivery stops. Wait awhile and it will start up again. I just repaired an IH 856 pump for the same problem.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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