[PalmFreightPete]

Thanks, both of you. It's the 4.6 Northstar, but its not the original. In some things it follows the documentation for 1994 models, and in some things it seems to match the documentation for later models. I'm pretty sure my Haynes manual was directing me to the intake piping at the air filter box. But I just couldn't find it. And since it was my first dive under the hood on this vehicle (and the disassembly and re-assembly were hours apart) I assumed I just forgot to plug the IAT back in. But I didn't want to pull the intake cover again if I didn't have to.

Anyway, your replies have helped. I'm sure I'll be able to find it now. Thanks!