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This is a spit ball - long shot possibility. My 2010 Camaro (prior car) started acting like your car and it turned out to be a vacuum leak with the catch can I installed. So, maybe your engine has a vacuum leak somewhere. Good luck and keep us posted.
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2016 Camaro 1SS Hyper Blue 6MT NPP
2010 Camaro 2SS Cam/Headers/CAI/3.91 gears
476 rwhp/440 rwtq (sold)
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