Issue with TPS Harness in '97 SE-R

[Darren]

Hello,

This is my first step into the Nissan world after owning products from VW
and Honda.  I purchased a '97 SE-R with about 105k three months ago.

The car has been hesitating a bit when shifting and I had a friend look at
the engine.  He noticed the harness for the TPS had been cut and rewired.
When we moved it around the ide obviously went all over the place, so I
figured it should be replaced.  The only harness I could find was off a
'classic' and I noticed one of the wires was not shielded.  The engine feels
okay, but it's not very smooth inbetween shifts.  I would like to know what
this wire does and if it pays to buy a new harness.