#6 misfire

I have a 1997 cherokee with new plugs (gapped correctly), wires, cleaned throttle body, cleaned IAC, and TPS tests fine.

The Cherokee is throwing a P0206 code along with P0132 and P0138

Any idea of what may be causing the misfire? I am leaning toward the #6 injector. Please comment.

That would be a good place to start. If it was me and you werent sure I would either replace that injector or if you don't have an extra injector just swap 2 of them around, clear the codes and see if the code moves to the new cylinder along with the injector.