I want to check/change a spark plug on my 98 Ford Ranger, 4.0. It's the # 5 cylinder. Where is this plug located on this engine?

I want to check/change a spark plug on my 98 Ford Ranger, 4.0. It's the # 5 cylinder. Where is this plug located on this engine? - 1

The older fords numbered their cylinders in a straight line.

V8 left side from front to back 1-2-3-4, Right side 5-6-7-8

If your Ranger is a 6 cylinder I would say from front to back, 1-2-3-4-5-6

If it is a 4 cylinder, you might look in the glove compartment or maybe the Trunk/Bed

Middle one on the driver's side.
I'm guessing you are getting a misfire code. You can try swapping fuel injectors too.