altitude or air density

[1iwilly]

so you guys are trying to say my suv is happier going to the beach than going back to disneyworl d.LOL

i found this=What Does the IAT Sensor Do?

In a nutshell, the intake air temperature (IAT) sensor helps the PCM (Powertrain Control Module = Fuel Injection Computer) make a correct measurement of the air mass that enters the engine.
The main reason why the PCM needs to know the temperature of the incoming air, is that temperature has an effect on the density of the air the engine is breathing. The denser the air, the more fuel the PCM has to inject into the engine.
Using the info provided by the MAF sensor, the PCM only gets to know the flow rate of the incoming air. With the IAT sensor, it get's to know the temperature of that incoming air and then is able to better calculate how dense that air is.
Calculating the flow rate and density of the air that the engine is breathing at any given time helps the PCM maximize everything from fuel consumption to performance.

Originally Posted by Riggodeaux

Lots of amateur comedians here, willy. Terminator might be getting to something, though - is there an altimeter or similar control that might have your fuel mix out of wack, even if its not related to leaving the comforting environment of Disneyworld for the beach?