I need to replace a fuel injector on my 99 Ranger 3.0 it is the #6 injector. What is the best way to replace it. Also can you give me the torque sequence and torque spec. Thank you in advance.

 

There is really nothing with a specific torque or pattern in what you are doing.

You just need to remove the upper intake, 6 bolts
Release fuel rail pressure via the schrader valve
Remove injector wires
Then remove the 4 fuel rail bolts.
The injectors are just clamped between lower intake and fuel rail by those 4 bolts, they have "O" rings at the top and bottom to seal them, keep track of those, they stick to one surface or the other, put a light coat of motor oil on them when reinstalling.

If you want a torque spec use 10ft/lb, so snug
For the upper intake start at the center and work to outside, you can reuse the gasket if it comes off in one piece

 

with that old of an engine I WOULD replace all 6 of them that are FLOW matched