You really need to find out what the code is. As I said before, the higher HP tunes were not changed at all (and as you said, they didn't turn on the check engine light before).
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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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