I recently bought a 1989 F150 with a 351W, C6, and 4x4. The truck fires up and idles like a new one. Sometimes it will try to stumble around once you put it into gear, but that is a rarity. The real problem comes in at highway speed. It will skip/misfire around 50-55mph if you try to hold speed. Under heavy acceleration it runs great with normal 351 power. I have felt the concern both when it's warm and cold, although I've noticed it more when it's warmed up. I thought a tune up would solve my problem, but to no avail. Here is a list of what I have done:

-motorcraft plugs gapped to 44
-ford racing 9mm wires
-motorcraft rotor
-new dist cap
-new fuel pressure regulator
-new 195 degree thermostat

This problem seems to be fairly common with these trucks... hopefully somebody can shed some light on it for me!

 

Here is some light from Steve83: 1983 Ford Bronco TSBs & FSAs (Recalls) for '83-96 Broncos & F150s

 

could the "crossfire" from the wires make it want to stall?

 

If two plugs fire at the same time, the pistons will want to counteract each other, and that sounds like it could be really hard on the motor.

 

Not very likely.

 

same could i get some help

 

Starting your own new thread would be highly suggested. Cross posting in a thread that has already morphed into multiples only results in confusion.

Based on your video and statements: No Codes. You most likely have a bad computer. And I also would expect multiple issues given your other info about the truck's history.

 

well i will start a new thread but i can say its not the fuel injectors or the computer because i just bought a reeman today and it made no difference i am kinda feeling cursed by this truck at this point is there any other suggestion

new thread (https://www.ford-trucks.com/forums/1...l#post18192395)