ok looked a bit more and the one on the top of the intake manifold is just an air temp sensor i think heres a pic
and while i was lookin at my spare one in the garage i noticed a sensor on the intake manifold barried under every thing in the pic its right in the middle of the intake between the intake holes
i hope this helps you out a bit, ps. this is all from a stock 93 b2200 fuel injected truck and sorry about the pic quality they were takin with my laptop