I lost my manual and I am trying to find the IAT(intake air temp)sensor on my full size 350 5.7 1989 blazer? anybody know or take a pic of where it is

 

I don't believe that your truck has a true Intake Air Temp sensor... I have found references to a manifold air temp sensor and it should be located on the intake manifold somewhere near the throttle body. However, the same reference lists it as a coolant temp sensor so I am unsure.

Hope this helps.