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GM is aware of this issue and the TSB "supposed" to fix the problem. I only know of two members that are still having issues after the reflash so they possibly could of had other issues unrelated to cat warm up misfire. The rest of the peoples that had the problem seem to be good after the reflash. I just wish I knew what is the reason behind this. This problem go back years, even affecting other brand of cars that has cat warm up cycle on cold start up. Within the GM cars, this problem exist from caddy's, all LNF, and even holden commodores.
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