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    Bucking? Variable RPM at constant throttle?

    Hi guys, new here and had a question for you all. I have a 2010 Yukon XL 5.3L with 150k on it. A few weeks back I was getting some stuttering/bucking between 1500 and 2000 RPM. Feared it was a transmission issue. Brought it to my mechanic who is usually pretty good to me...he said he thought it...

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