I’m at a loss of what to try next ….a little history.
2016 Yukon Denali 6.2 the AFM lifter went bad so I decided to use a Texas Speed kit to delete it. I also have a Black Bear tune on it.
Here is what I had the shop install.
Texas Speed & Performance Gen 5 LT1, LT, L83, & L86 DOD Delete Kit...
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