Join Date: May 2005
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PMT and NVK are both box codes used on late 99 - 2001 Auotmatic 7.3 engines. Either one of these codes can be used on these trucks to over right the existing program. If your chip has a PMT program in one position then has NVK in anouther, it will cause the truck to stumble or even kill the engine. To clear up the problem all that needs to be done is to check the codes on the chip and make sure they are the same on all the settings. If this isn't clear let me know and I will try to explain it better.