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i have a 78 ford 4x4 f150, its got a 351m to a 400. i got the truck not too long ago, and drove it for a couple of days and it started spuddering, so i timed it, put new plug, wires cap and button. and it kept on spuddering wen i drove it, it would idle fine but wen u put a load on it it would spudder, so i put a edelbrock 650 on it and it did a lil better, so i checked the vaccum advance and it was moving the distributor thing like it should, im not sure what the problem is, could it be fuel pump, coil or sumthing else,
i have a 78 ford 4x4 f150, its got a 351m to a 400. i got the truck not too long ago, and drove it for a couple of days and it started spuddering, so i timed it, put new plug, wires cap and button. and it kept on spuddering wen i drove it, it would idle fine but wen u put a load on it it would spudder, so i put a edelbrock 650 on it and it did a lil better, so i checked the vaccum advance and it was moving the distributor thing like it should, im not sure what the problem is, could it be fuel pump, coil or sumthing else,
Sounds like the electronic box. But could also be like you said the fuel pump or coil.
now im thinkin its the distributor, im thinkin this bcuz it reves up fine, i think the spudder is more like a skip, i think the distributor is walkin wen u drive it, im probly just gunna get a new 1, heck it couldnt hurt havin a new part on it