Camshaft Postition Sensor?

[VaBoy]

Hi all! I'm a new member and need help.
I have a 1994 Ford Ranger with V6, 4.0L (244 CID); OHV 12V; EFI motor.
My truck has been running a bit rough for a while now - the main complaint (among others) is it "Bucks" or "misses" when I get to 45 mph. Sometimes roughly, and sometimes slightly, but always noticable.
I have bought a camshaft position sensor (CPS) from Auto Zone to change that out to see if it will help - only the sensor, not the synchronizer assy (I have already changed out the MAF, Air Filter, PCV valve, fuel filter, plugs, and wires).
My problem is - I can't seem to find the CPS!
My Haynes Book says "....Not all models require a camshaft position sensor..."
Can anyone tell me how I know if my model requires the CPS?
And if it does, where it might be.

Thanks - VaBoy (aka Russ)

 

[FritzTKatt]

If it's a federal emissions vehicle, just go return the part before you even open the box. They only exist on california models.

 

[adsm08]

Feel around in the center of the engine behind the intake. The CPS is back there. If you only feel a flat circle just raised above the block a hair you don't have a CPS. If you grab something, you do.

Your issue is probably ignition related, not a bad sensor.