ok i have an 84 ford f150.
i usually have to let it warm up for about 10 minutes for it to run without dieing on me. but the other night i took it mudding after at least 15 minutes of previous driving and when i started going slow and i would gas it there would be no response and then it would just die. can anyone help me with this?? thanks

 

Engine? Carb or FI?

 

oh sorry its a 351w v-8 with a holley 4 barrel

 

Replace the fuel filter and consider rebuilding the carb.

 

well the carb is brand new.
but ill check into the fuel filter. thanks

 

Are all the adjustments and settings in the carb correct? You can't just take an aftermarket carb out of the box and slap it on an engine without doing a full setup. There are specs to follow.

 

well the thing is i just bought it and the guy i bought it from said the carb was put on by a machanic.
so assuming that he was telling the truth i would say it was put on correctly.
but u never know.
ive noticed that it runs fine going above 20 mph but when ur just crawling around on a dirt road it stutters alot.
the air cleaner is brand new and the fuel pump is new.
im gonna look io replacing the fuel filter this weekend

 

That's a bad transition circuit in the carb - the spot between idle and full run. The carb ain't set up right.

 

is that a hard fix?
ill look into that to.
thanks

 

It's an easy fix if you can find someone who remembers how to work on a carburetor. Don't take my diagnosis as gospel - it's just what I think it might be from my past experience. Someone who knows what they are doing needs to look at and drive your truck.

It could be as simple as a misadjusted float level - the bouncing around on the back roads could be starving the bowl and it's sucking air.