318 Engine stumble

With the car at operating temperature.
I can slowly press on the gas.

As soon at it hits 1200 rpm it starts to surge.
When it hits 1600 the surging goes away. Maybe because the main jets take over?

We looked at the accelerator pump. It seems like it’s coming in late when flooring the gas pedal. The stumble starts and then the squirt happens right after.

When it hits the 2000 rpm above. Slowly raising the gas. That’s about the time the main start to kick in.

With the car off. The accelerator seems work just fine and seems to pump enough fuel.

Basically .....between 1100 and 1600 rpm there is a flat spot

When driving it the car just dies when I hit the gas to give it some power. If I feather it I can get through the dead spot and it’s fine.


It did backfire out the intake 1 time when I just floored it from idle.