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When I had my 2012 LS, I was experiencing the same thing only mine would stall or try to stall just after filling up some times. Turns out the float in the gas tank wasn't working correctly allowing me to overfill the tank sending raw fuel into the line that checks for leaks sending a loose gas cap light. When the system checked for leaks, it had fuel in that line and causing the gas cap light to come on. The work was done at Bill Fox Chevy in Rochester Hills Michigan if you or your dealer can't get it figured out.
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