So I bought a 1967 F-250 with a 360ci and a c6 tranny about 3 weeks ago. Everything ran fine, I use it as my daily. But new years it wouldn't start, I Replace the fuel pump fuel filter and put an inline filter before the pump to see if the tank was dirty. It wasn't. Replaced the starter fixed all the engine grounds and the carb. Put in a holley 4 barrel.

She's been starting and running fine till this morning. She'll start up fine idle fine put her in gear then the motor just dies. Then as trouble starting back up. I have to bring up the rpms then slam it in a gear. If I stop to fast when driving it cuts again.

 

Welcome to FTE!
Well, 1st let's find out what you're working with. My 1st reaction is the condensor in the dizzy (distributor) that's gone out on SO many of us. Since 1968 was the 1st year for 360 and C6 we know some things have changed on your truck. Still a points Dizzy or been changed to electronic ignition. If electronic is it Ford Duraspark or aftermarket? What happened just before when it wouldn't start on New Years? Any work done? Did you just get gas at a different station? Any wierd things going on the last time it was driven (12/31/14)? Stuff like that.

 

To me sound like the carb needs the air/fuel adjusted or idle is to low and choke not working right. All lot guys don't know how to start these old trucks .

And ever since EFI came along you'd just turn the key it starts on newer vehicles.

Well these old girls still need a pumping the gas pedal 2-3 times to set the carb on fast idle if the auto choke is setup right.
Orich

 

Personally I am with Jeff in a way. Sounds like the issue is an ignition problem. It happened before the holley and after. I have some wicked ignition problems on mine including the condensor and dizzy and if your electrical is insufficient than you're gonna experience the problem of having to give more rpm's. I'd start with the condensor, points, wires, coil and then dizzy. Obviously if the new carb needs adjustment then that's an issue but if fuel checks out clean then go with 'power'.

Edit: I have experienced some of the same issues with a vacuum leak from the vacuum advance to the carb

 

Bogging down, hesitating, stumbling from a dead stop or when accelerating at speed can be caused by a defective accelerator pump diaphragm and check valve.

Is it a 360? The only V8 available in 1965/67 F100/350's was the 352 2V that looks identical to the 360 & 390 used in 1968/72 F100/350's.

Is it a C6? 1965/67 F100/350 352's came with MX Cruise-O-Matic, that has 13 trans pan bolt holes. 1968/72 F100/350 360/390's came with the C6 that has 17 trans pan bolt holes.

 

Is there much fuel in the filter, or is it mostly air?

 

Found out the problem, you guys are gonna lol when you hear this. The ignition wire running through the fire wall was snagging on the brake where it mets the booster rod. So when I went to hit the brake, it would short and cut off the motor.

BTW its got an MSD ignition system. And when I pulled the spark plugs to check them out, they were very clean. Idk how recently they were change from the old owner. But a friend of mine told me plugs need to have a nice brown to them. If they are to clean that means I'm running leaner, right?

 

I *think* that a proper heat range plug generally tends towards a bit lighter color today, because fuel no longer has tetraethyl lead. Deposits are quite bit reduced.

 

Now-a-days,clean with just a slight brownish color is the best. The brownish hue comes from the oxygenated fuels and/or the fuel system cleaning agents put in them that are now used. Like ethanol. If your area does not use this fuel then clean would be good.

 

Yes it is a 360, and a c6. The last guy who had it did a rebuild swap.

 

So today on my way to work, the truck fired right up that it as been for 2ish weeks now no problem. Went a whole 200 yards when it shifted into 3rd the engine cut out. Then wouldn't fire back up. Its getting fuel, its cranking fine, just won't turn over. So I didn't have anymore time to **** with it. I rolled her back to my house and took my 78 Lincoln Town instead.

 

Do all the basic checks for "Spark" at the plugs, coil if no could be dizzy condenser has failed.
Or is Choke not opening enough and caused flooding.
orich

 

What's a dizzy condenser?

 

The condenser is a series resonant capacitor to help speed the collapse of the voltage induced in the coil and prevent arcing of the points.
http://www.smokstak.com/articles/capacitors.html

 

I'd say it's time to buy a manual so you'll learn basic stuff.
Of your engine parts.
Orich