03 Sierra P0332 4.8L

I looked at some you tube videos on replacing both of the sensors under the intake manifold. Not a fun job but its got to get fixed.

Parts list so far
2 knock sensors
Intake manifold gaskets

Here's a few of my questions.
Should I replace the intake manifold bolts?

The video says to replace the knock sensor harness also. Is that necessary? Which KS harness? Rock auto has numerous to choose from.

http://www.rockauto.com/en/catalog/gmc,2003,sierra+1500,4.8l+v8,1415416,electrical-connector,knock+(detonation)+sensor+connector,1332 6
Thx

I would repl.the intake bolts, they are torque to yield. Check for tsb's on the knock sensor codes for more info.