Same thing happened to me on an 09 Yukon with 40k mikes over thanksgiving.
I took it to the dealer and they replaced the throttle body. No more issues and it was all under warranty.
Good luck!
Great call on installing the Denali grille. I've got a 2010 SLT and want to do the same thing.
Does anyone know the part numberss for the upper and lower Denali grille? I used to have it but misplaced it and dealerships won't give it out.
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