Rich smell under acceleration

[pocketmaster]

07 SXT 3.5L....I have noticed when under heavy acceleration I get a rich smell in the cabin. I have almost 150K miles on the vehicle. It runs great. Anyone else have this issue. I was thinking possible manifold gasket, but under normal driving it doesn't do it. I do have a CAI on the vehicle. I have only just started noticing this within the past 10k miles.

[NOTPAID4]

I'd suggest cleaning the throttle body and checking the spark plugs & air filter; any of these are dirty or bad you will get that smell.