Fucking datsun

id also check dizzy cap/rotor as that has been a source of strange misses and stuttery lag on some of my old nissan/datsuns in the past

Accelerator pump diaphragm

I've had the same problem with my carb. No vacuum leak as there isnt any besides 1 hose to the distributor.

Someone told me its a lean misfire but something's wrong. The carb is a Weber and the problem is intermittent.

Fuel mixture adjustment changes nothing. Idle is correct.

Starts to bog/die when the car is off choke/warm.

I'll check that next, maybe take some sandpaper to the contacts in there.

You'd think the carb shop would've caught something like that but maybe not

fuel filter clogged?

your diaphragm is probably good if the carb was just rebuilt. the hesitation after WOT means you need more fuel though. The carb should have an adjustment for the accelerator pump (on my pickup you can hook the rod into several different links for more/less extra fuel; takes 3 seconds to do). Just set it up for a bigger squirt and see if that fixes the hesitation.

Check your clutch by holding the brake, putting it in 4th or 5th and letting out the clutch. If the engine doesn't stall your clutch is fucked.

fuel filter seems good, it's clear and upon inspection appears to be getting new fuel in. it's also brand new.

I'm taking it back to the shop saturday to get the carb adjusted on the car

will do

fuel pump?
did you put new metering needles in when you 'rebuilt' the carburetors?
for the record, the carburetors are more than 35 years old, you might want to just replace them

>not knowing how to work on your own carburetor