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    Very Hard 1-2 shift, Service Stabilitrak Light

    I am having the exact same issue on my 2007 Ykon with 70K miles- I am really nervous as it is in the shop now in san diego and they are looking at Valve springs !! I don't want to be a budinski but I may have to point them at the throttle body or teh wheel sensor- The service agent is worthless...
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