r/EngineBuilding • u/MFJL86 • 11h ago

1978 351m

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What can be causing this, it seems like it's not getting enough fuel at acceleration or the air to fuel mixture is not correct. Please forgive my ignorance. Any advice is greatly appreciated.

14 Upvotes

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2

u/MFJL86 10h ago

I will add, it starts up just fine no problems. But it is over accelerated when it starts. Now that you guys are talking about it and maybe the accelerator pump.

6

u/wastedwu 11h ago

Check your timing. Make sure sparks are doing the sparky things.

5

u/Slight-Tennis-6659 9h ago

It's either timing or a massive vac leak. Fuel issue it would be lean popping in his face

4

u/tomcat91709 11h ago

Something in this is really off. Timing or wrong spark plug wiring or something. Also, I'm curious about the tip-in delay? It seems to be taking a really long time, like there's no accelerator pump.

3

u/Slight-Tennis-6659 11h ago

1 to tdc and it's just wires on the cap in that order, counter clockwise

4

u/v8packard 10h ago

It's shaking like it has a dead cylinder

2

u/Good_Elephant5511 11h ago

Would agree with you. It idles too well to be timing in my opinion. Sounds like a fuel issue.

2

u/mrbigpower 1h ago

Accelerator pump

2

u/WyattCo06 36m ago

It's literally skipping at idle.

1

u/Slight-Tennis-6659 11h ago

Weird side hung floats on a truck too. Do the firing order over first. Original is 1-3-7-2-6-5-4-8 If that doesn't work it could have had a cam swapped out?

2

u/Rurockn 11h ago

Sounds like firing order is wrong or there's a dead cylinder, I'm on board with you.

-1

u/Beginning-War2347 11h ago

Check your firing order and remember Ford goes 1334 down the right bank and 5688 down the left bank and not back and forth like gm and dodge