Can you turn it to the lope mode while driving and have it continue running? If not, there is a problem with the programming on the chip. 5 and 6 should run just fine as well as they are simply "stock" settings.
If the truck dies going from 3 to 4 at an idle, it may be your trucks' reaction to the severe changes in IPR and ICP...try switching it with the RPM around 1500 then let the idle drop down.
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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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