1980 ford f100 straight 6. truck was running fine then got to where it would not idle. changed plugs and wires but did not help also moved distributer to check timing with no luck neither. any ideas would be greatly appreciated.

Question edited for clarity and order.
Question moved to model category.

https://www.google.com/search?q=1981+Ford+F-250+Ranger+Starter+relay+fuse+location

Fuse Specification Chart

fordservicecontent.com https://www.fordservicecontent.com > Home > Content
The fuse panel is located under the instrument panel to the left of the steering column. Note: It may be easier to access the fuse panel if you remove the ...

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  Fuse Specification Chart

  https://www.fordservicecontent.com > Home > Content
  The power distribution box is in the engine compartment. It has high-current fuses that protect your vehicle's main electrical systems from overloads.

1980 f100 fuse box diagram - Ford Truck Enthusiasts Forums

Ford Truck Enthusiasts https://www.ford-trucks.com > forums > 859350-1980...
Jun 13, 2009 - 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 1980 f100 fuse box diagram - Did anyone ever turn up a fuse box diagram for the ...

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carb settings such as idle mixture screw, choke settings, vacuum leaks at base or vacuum lines.Does it stay running off idle?

Hello kat801931,

The firing order is:

1 5 3 6 2 4

Below is a picture of the cylinder order and the distributor. Number 1 cylinder is at the "white" location on the distributor. Good luck.



Regards,
netvan

yeah with motor mount change & trans. mount change little bit of wiring issue it will run fine. they put chevy engine in ford mustang all the time that why they run run so quick

I would suspect there is dirt in the idle system, did you blow the jets and passages out with compressed air.

The F100 ended in 1983, so there is some confusion on your 1987 Ford F100. The F150 started in 1983 and was available in 1987, but not the F100. You have this listed under the 1981 Ford F100 category.
The 300 CID = 4.9L In-Line (Straight) 6-Cylinder.
In order to best answer your question I have included both the 1981 F100 4.9L and 1987 F150 4.9L below. The only difference is with the Distributor Cap Configuration and Connections.

For the 1981 F100 300cid=4.9L:
Firing order:
1-5-3-6-2-4
Cylinders:
(back)
...6
...5
...4
...3
...2
...1
(front)
Distributor:
...(back)
.........4..[.]-clip
2
...................1
6
................5
[.]....3

For the 1987 F150 300cid=4.9L:
Firing Order:
1-5-3-6-2-4
Cylinders:
(back)
..6
..5
..4
..3
..2
..1
(front)
Distributor:
.......(back)
.................4
.....2
[.]
.......................1
..6
.........................[.]-clip
....................5
.......3
.........(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

1980 FORD PICK UP NO TAIL LIGHTS, BLINKERS, OR HORN. WHAT IS IT?

The vacuum comes from the intake manifold and ported vacuum comes from the carb above the throttle plate. You might have a leak at the carb gasket or intake manifold gasket. Spray some car cleaner or WD40 around the gaskets and vacuum lines while the engine is running and when you hear the idle speed up, you've found the leak. You will need to install the rebuilt carb first, and you should tighten any loose intake manifold bolts. Don't overtighten them. Also check the EGR valve because it could cause the engine to stall at idle. A good tune up might be needed too. I've seen some of those engines run real rough when the ignition timing was off.

I have somewhat of the same problem but not really. I would check the fuse but you have probably done that. I would run new medium grade wire from powerpoint ( 12V source ) that is hooked up to your ignition. Then run to your choke wire. you can also do a manual set of the choke to get it started. My choke doesn't work at all and needs to be replaced. Having the same starting problem though.

0.81 - 0.91 millimetre