Still chasing vacuum leaks

I have just replaced the intake manifold gaskets etc.on mt 2003 with the 4.2 . I have run the motor and am still getting codes 0171 & 0174, but now I am getting code 0332 which is the knock sensor bank 2.
A number of sites have differing locations for the knock sensors including under the intake manifold I have replaced.
Can anyone tell me where they are, It was a knuckle buster getting the hookups on the back of the manifold and I am not looking forward to going thru it again.
Should have kept the E-Type ,that was easy!!!