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thanks, I have the 16176424 ECM - is the 12 pin port the wrong one? Apologies for asking stupid questions but I trying to get my head around exactly what I have as it appears the ECM has been retro fitted to my 1989 LT1 powered C1500. I am keen on the NVRAM upgrade but I am not sure if it will work as it appears the ALDL interface I require isn't compatible. Any further guidance is appreciated.
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