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check for leaks pre maf, post maf and in the exhaust. You likely have no codes because the tuner set them to no error reported. You will need a scan tool like HPTuners to take a look at what is going on with fuel trims. Could be a bad O2, burnt O2 wire, or failed Cat. When the O2's are messed up, the fuel trims go way off and make the car run like garbage.
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GM Gen V Calibrator
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