Mysterious dead spot

[Robhimselfff]

So this has been a problem with the car since before I recently put it back on the road this past June.  Under load the car always has the strangest dead spot in the throttle, and in order not to stall out the car  you have to feather your way past it.  It's something I've gotten used to but with the dead spot there's no way you could put it to the floor from a stop or slow roll without it stalling out.  It's a 318 car with an automatic.  The carb has been rebuilt on the car twice since June to try to troubleshoot the problem, but I really have no idea what else it could be.

[4 speed fish]

A friend of mine had the same issue.It was the distributor.

[72cudamaan]

What kind of carb?, engine mods?  First guess is accelerator pump but you didn't give a whole lot of info.

[MEK-Dangerfield]

Is this a vacuum secondary or a mechanical secondary carb?   

[jimynick]

It may not even be a 4bbl. The off-idle stumble sounds like poor accelerator pumping and regardless how many times the carb was rebuilt, put on some safety glasses, start it up, take off the air cleaner and with a good light, watch for a good strong squirt when you wack the throttle. Check the timing while you're at it. By the by, what kind of carb IS it?

[73restomod]

Also, does the trans go thru the gears normally? May seem like an odd question, but it narrows the list of suspects. It could be more than one problem exasperating the carb/timing issues is all.

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[cudabob496]

borrow friends carb
if problem still persists, then its not the carb.
but agree, squirters are first thing to look at.

oh, just remembered, my cuda did that under acceleration, turned out
primary jets were too small, and engine was running out of gas, until
secondaries kicked in.

[Super Blue 72]

   Not sure where the dead spot is but if it's off idle like jimmynick mentioned I would guess accelerator pump first. 

When does the dead spot happen exactly? 

Also, is this something that just happened while the same carb was on engine?  Is it a new/different carb on the engine? Is the choke open all the way?

[Chryco Psycho]

Could be springs in the centrifiugal weights .
 Float level as well as a number of other transistional problems can occur as the throttle is opened