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I have not experienced something like this. My guess is you have a slight exhaust leak before the cats. Since the HVAC intake is on passenger side, I'd check your passenger side exhaust manifold. If you have a leak, it's probably at the manifold flange (where it meets the exhaust mid-pipes).
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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