Ouch! OK, I forgot that table blush

Let me do a little test: I'll force the PCM to work in SD mode and simulate the IAT signal with a potentiometer, let's see what happens with the fuel trims.

I noticed that the IAT sensor in the Corvette is in a pretty cool place, in the F-Bodies it's pretty close to the engine and can pick up a lot of heat. Have you noticed that? (mine is a 98 Trans Am)