Waldig!

That "resistor" your replacing is NOT a RESISTOR! It is called a THERMISTOR. It is a temperature variable resistor, when the temperature goes up, the resistance across its wires decrease. When the temperature goes down, the resistance increases. In no way will a fixed resistor work in this application. Your insertion of a fixed resistor in the IAT sensor is to "fool" the computer into adjusting the fuel/air ratio making it burn more gas for the air entering the intake. This does increase a little, the power you have available since it is running rich all the time. This also costs more in fuel used, but you don't care if your goal is more power.

I digress, the temperature sensor is a THERMISTOR, its function is to just display a value digitally, given its range and application. Its very word (thermistor) tells you it is a temperature sensing resistor. Its construction and function differs greatly from a fixed value resistor. If you install a fixed resistor in this application, your display will read almost a constant value across a wide temperature environment.