Where is orifes tube located on 1987 toyota pick up.

There are several there is also some under the hood near the battery location, can you be more specific or are you just wanting a pic or something for future purposes?

What engine 3.6 l or 4.6 l ? Doesn't have a PCV valve .
A crankcase ventilation system is used to consume crankcase vapors created during the combustion process instead of venting them to the atmosphere.
Fresh air is supplied through a filter to the crankcase, the crankcase mixes the fresh air with the blow-by gases and then passed through a positive crankcase ventilation (PCV) orificed tube into the intake manifold.
The PCV orificed tube restricts the flow rate of the blow-by gases using a 3 mm (0.118 in) (a) orifice located at the end of the tube. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the throttle body in order to be consumed by normal combustion.

Your best bet , take it to your GM dealer

Crankcase ventilation system is used to consume crankcase vapors created during the combustion process instead of venting them to the atmosphere.
Fresh air is supplied through a filter to the crankcase, the crankcase mixes the fresh air with the blow-by gases and then passed through a positive crankcase ventilation (PCV) orificed tube into the intake manifold.
The PCV orificed tube restricts the flow rate of the blow-by gases using a 3 mm (0.118 in) (a) orifice located at the end of the tube. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the throttle body in order to be consumed by normal combustion. Positive Crankcase Ventilation Hose/Pipe/Tube Replacement
Remove the two nuts (2) from the fuel injector sight shield (1).
Lift the sight shield (1) from the front and pull forward to disengage the rear tab from the bracket.
Disconnect the PCV fresh air tube from the left camshaft cover.
Remove the PCV fresh air tube from the throttle body.
Remove the drive belt. Refer to Drive Belt Replacement .
Remove the power steering pump retaining bolt.
With the hoses still attached, Carefully position aside the power steering pump.
Remove the retaining clip securing the PCV dirty air tube.
Disconnect the PCV dirty air tube from the PCV orificed tube.
Remove the PCV dirty air tube from the intake manifold.

Could be clogged throttle. Get a throttle spray and clean the the throttle body and the jets.

For FUEL FILTER details, check the help links mentioned below:---

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Where is Fuel Filter Located on 1987 Toyota Camry?

http://whatisbyme.blogspot.in/2012/05/where-is-fuel-filter-located-on-1987.html

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2004 GMC ENVOY: Where is Fuel Fill Tube Located?

http://schematicsdiagram.blogspot.in/2012/06/2004-gmc-envoy-where-is-fuel-fill-tube.html

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How to replace fuel filter on 2000 holden VT Commodore?
http://technoanswers.blogspot.in/2012/02/how-to-replace-fuel-filter-on-2000.html
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These will help.
Thanks.

the orific tube is in the low psi side very near battire .might look like flying disk about 3" across and about 1/2 " thick if you have the updated version.Be careful light weight tubing.

inside the gas tank.

It's located at the front of the engine usually gold and on the left hand side of the rocker arm cover almost directly across from your distributor cap. Can't miss it.

there are 2 fuse centers, one is under the hood on the passenger side and the other is under the dash on the drivers side

The knock sensor is located on the right side (passenger) of the motor near the back, its a one wire connector probably either black or blue the sensor goes directly into the block