Ground wire locations

[Mario12345]

does anyone know where the ground wires are located for the stock straight 6 motor because when I idol it start to go low then catch back up plus it's not really running to full power potential and I can't understand why .... any ideas

 

[retrofive]

What year/model?

This is for a '96
https://static1.squarespace.com/sta...442806549877/1996+Toyota+Land+Cruiser+EWD.pdf

 

[Mario12345]

What year/model?

This is for a '96
https://static1.squarespace.com/sta...442806549877/1996+Toyota+Land+Cruiser+EWD.pdf

Thank you for the help do you have an 80s landcruiser ?