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unfortunately from what i have been trying to do for the longest time, is the same thing, disable the AFM on my 08 gmc sierra 5.3L and have found no easy way to disable it without a tune from a shop. I have a performance exhaust and a air-intake system and programmer from edge but still have to have it taken to a professional shop to have it tuned so the AFM will not work keeping it in V8 at all time. Sorry if this didnt help but like i said there's no easy way to have it done.

2008 GMC Sierra /w 4.5" lift, 35" Kelly Safari TSR tires, 4" performance exhaust, AEM intake, Edge evolution Programmer

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Q: How do you disable active fuel management system on 07 gm 5.3?
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