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    Ecm tuning question

    Good morning new member here. So I have an ecm question. I have a 1992 GMC sierra SBSC that I recently bought. It was originally a 4.3 TBI 5 speed manual. Guy I bought it from did an engine swap it is now a 5.7 vortec 5 speed manual. He claims the engine is from a 97 suburban but I'm not sure...
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