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The sensors in the MAF might be dirty, or you need new plugs. When is the last time you changed the plugs if ever?
It might also be a shot O2 sensor, but I think you would throw a code for that.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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