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Thanks for the help.. It was the throttle body module. See ya. The worst forum I've ever been on. Hurry moderator and erase me.

My wife was stranded last night in our 2009 YukonXL, 49k miles. Vehicle went into limp mode (wouldn't drive over 20mph) and she reported shaking as if a tire had blown. Message read: 'engine power reduced, service Stabiltrak, service traction control.' Vehicle was towed to dealership. Any...