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Hello and welcome,,
Ineed A help please about reflashing with deceleration backfire at hp tuner at 2016 GMC Sierra 5.3m Give me a instruction please about doing that
The first thing you'll need to do is disable the DFCO so that the injectors continue to inject on over run. From here the results will depend on the exhaust system and how free flowing it is. You can tune the results by retarding the timing in over run conditions, as well as targeting a slightly richer AFR.
