Re: In warm temps....
Yes, the air mass sensor senses the hot less dense air and after the engine gets warm the performance is not quite what it is in 80ish weather because timing is held back and fuel is sprayed in at a lesser rate - there is a technical discussion about this in the search - but it boils down to the air mass sensor and the ECM. Also, a larger diameter exhaust will trick the ECM into thinking the air is even less dense and cut back fuel delivery more - there's two posts on that too. When I drove through Nevada at 110F last year I noticed the same thing.
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