Just finished doing an afm delete on a 2014 sierra l83 with a LOT of help from clinebarger.It fired up quickly with almost immediate oil pressure and runs smooth as silk but the check engine light is on and codes P0300 and P0138 are showing as permanent on the scanner.I ran it for 20 minutes so the new springs would break in properly and watched everything for leaks ,temp,oil pressure ect and all good.The afm function was shut off prior to me getting truck with an hp tuner.I understand...
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