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I have a 2010 LTZ V6 Auto that is reluctant to upshift from 3 to 4 most times unless I let off on accelerator.
 

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muzzyc6 said:
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I have a 2010 LTZ V6 Auto that is reluctant to upshift from 3 to 4 most times unless I let off on accelerator.
Bring it to the dealer, and they can re-flash the computer.
 
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