The IPR (Injection Pressure Regulator) valve that you are talking about could be the culprit. Usually when we run into idle stability problems that are not consistent from day to day, it's caused by either a worn/sticky IPR valve or high-mileage engine oil.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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