i got a cel code and it came up as IAT Sensor (Intake Air Temperature) defective circuit or unplugged / defective sensor. Anyone know where to find that sensor what one is it.

 

What kind of engine do you have?

The sensor will probably be mounted on the Intake Manifold and will usually be mounted on one of the intake plenums. Different engines have them mounted in different places.

 

might actually be under the intake plugged up into the intake if its stock,

 

its a ls turbo so it would be on the intake manifold but which one there is like 3 sensors

 

If I'm not mistaken the IAT sensor on a B18B engine should be on the number 1 or number 2 cylinder's intake plenum. The sensor will be plugged directly into the plenum and will have 2 screws holding it in.

Just look on the intake plenums and you can't miss it.