Giant dead spot on holly carb.

mud racing... go to take off on green and smash the pedal to the floor and the engine cuts right out for like 2 seconds then goes like a raped ape..... holley 750 with vacuum secondaries.
any idea's?

Lean Stumble.

Possible causes, NO or not enough accelerator pump shot.

Some fool puts a screw in the mechanism on the vac secondary linkage to force them open.

Lean idle mixture.

Low float level.

There are more..



dkp

If you are not leaving from an idle, you're using up a lot of pump shot.

Another thought if you run a vac advance be sure its on the right port.

Really bad vacuum leak??

Is this a new problem that started out of nowhere, or is it a result after swapping a few parts?

was way to lean all the way around