i didn't realize u were getting codes on this thing (maybe it was written and i just ignored it--mine rarely throws codes when it's acting up)--doublecheck all of your wiring, especially your grounds. check and make sure there aren't supposed to be some ground wires attached to the manifold or starter area that got left off. unplug the tps and computer and ohm check the wiring, maybe u broke a wire in the harness or tps connector while messing around? do u have connectors for the a/c or p/s that were left unplugged (probably won't throw that code, but worth checking)?
by the way, why did u replace the intake in the first place? was it the manifold or the gsk that was replaced?