87'ford ranger , cuts out runs real bad, sometimes wont start ,, replaced fuel pump fuel filter, ignition module, and now some sort of pic up relay of sum sort but dont know fast n easy way 2 replace it ?

Several things could cause crank but no start. In my experience the most likely causes would be:
1) Clogged fuel filter
2) Bad fuel pump relay
3) Bad fuel pump.
4) Bad control module
Replace fuel filter first since it needs to be replaced every so often anyways. If still won't start
You can swap fuel pump relay with another same relay in fuse box. Easy way to rule out the relay.
Test fuel pressure. If low or no pressure
Test control module. If good,
Replace fuel pump.
I had same issue with my 2005 Ranger 4.0 several months ago and replacing fuel pump fixed it. Runs great now.

You didn't tell us is you have the 4 banger, 3.0 or 4.0 V6 engine.

The engine can stall for a number of reasons. For a engine to run it requires air, fuel, compression, and spark at the proper time. I doubt air is the problem. The fuel pump may be cutting out (bad pump, bad relay, bad pump wiring inside the tank (my 93 3.0 Ranger had the last issue). The engine stall could be a lack of fire to the plugs. A bad (cracked) coil, ignition module problem, EFI computer or wiring problem, or maybe an ignition switch problem. The starting system is somewhat isolated and pretty much separate from the ignition system in general. This makes me suspicious of your ignition switch.

What year? Inertia switch tripped. Fuel air spark compression. I have seen inerta switches plugs pulled out on the passenger side floor board many times. People's feet.

HAVE YOU EVER SERVICED THE FUEL FILTER ? EVERY 30,000 MILES ,"DEFINE JERKING REAL BAD" IS IT A STICK SHIFT? ANY OIL LEAKS COULD BE GETTING ON CLUTCH. AND CHECK ING SYSTEM COULD HAVE SPARK JUMPING

have you tried the ignition module on the distributor ? thats how they act when they go bad then they go altogether and wont start at all

intank pump bad

Have you checked it for spark when it dies? It sounds like a bad ignition module.

got 1987 ford f-150 no power to fuel pump, checked fuel cut off swith seems ok, new fp relay still nothe can I run hot wire to pump and if I can which ones the hot wire??

try changing the igniton module on the distribuitor in most cases it's the problem if you dont want to buy it you can take the ignition module to a autozone and they will check it for free

Two things, Check the map sensor, Next check the Ignition Control
Module. I just fixed this problem on my 87 Ranver V6 2.9 two days ago.
it drove me nuts until I checked the module attached to the back of the distributor. There is a plug connected to it at the left side of the Distributor. Use a small screw driver to slip under the retainer clip on the rear of the module. Pry out, (be careful so as not to snap the plastic
retainer clip) Pry clip away from the module and pull the plug out.
There are two screws holding the module to the distributor. Ford has a special tool for removing the module. I did not use it. Remove the distributor cap, look inside to the back of the distributer. You will see where the screws are connected. Loosen the distributor locking device,
(retains the timing position) Then rotate until you can access the screws. Replace the module, then reverse the procedure. You will need to re-time the engine, unless you mark the distributor position and someplace below the distributor as a reference mark.
Good luck!
Hugh
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