So a long while back the EGR fell off my truck and ever since I get the typical codes and check engine light. I read a lot where some people do EGR delete and get no codes.... This is my question. I work at a chevy dealership as a tech so could I reflash my ECM to a specific stock setup and does anyone know which flash I should do to not get the check engine light? Maybe an older one or possibly a newer updated flash on it. Any ideas guys?