Post deleted by sharpie

Carb diagnosis without being there is next to impossible, but as a guess? I'd say you still have a fuel contamination issue somewhere.

I don't know that this will fix your problem but if your filter was full of junk I would remove the tank, clean it out and blow out the lines. You might be getting garbage in your carb(s).

I fought carb problems for months once, changed them out, rebuilt, etc. It turned out that the laser pickup im my malory ignition was dusty.

2 seconds with a q-tip fixed it.

May not be your problem, just going to "toss" it out there,.......sounds very similar to a "ghost" problem I onced chased, it was eventualy found to be very minute rust particles, unseen by the human eye that were clogging/gunking up the fuel system,....apon initial tank inspection the tank seemed clean,.....but condensation (from sitting) had formed fine rust particles on the ceiling of the gas tank, didn't find this until I had rebuilt the carb, replaced the pump, the fuel filter, replaced the fuel lines, etc, etc ,......finally after still having bouts of intermitten days of good and bad running, I finally installed a clear sight, smallest micron gas filter I could, then the rust started showing up on the screen, the rust, being so small, was more like a film, not particles, but none the less it was clogging the small passages of the carb,.....replaced the tank, flushed the system, never had a problem afterwards

Mike

sounds like a vacuum leak. I'd guess the base gasket since you change the carb and it goes away for a bit. Maybe the mount flange on the manifold is warped. Try doubling the gaskets.

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I then found that the fuel filter was full of garbage, so I replaced it.

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That old fuel filter that you replaced, how old was it? Did you ever replace it?

You bought this car non running, correct?

Have you unscrewed the gas tank sending unit and look inside? Are you sure it still has a tank "sock" (screen filter) on it?

take the carb off & flush it good w starting fluid & hang a container of clean gas above it like a bag of plasma in a hospital & now see if your OK

It sounds like the fuel has trash in it, most likely rust or something stopping up the carbs, if it was ignition, it would most likely act the same with any carb, even a vacuum leak, i would check the fuel filter (cut it open) to see whats in it, there must be small particals getting through & stopping up the metering in the carbs, this will cause idle issues & stalling/hard starting.

Could fuel really be giving me intermittent problems like this?

The fuel filter I replaced was actually pretty new. I know some garbage is coming through the lines. Maybe it's time to clean the tank, because I haven't messed with any of that yet.

I don't build a car without replacing the tank the lines and the pick up. 40 year old sludge builds up and breaks away slowly. I've cut solid looking lines only to have them crumple from rot.

Allot of these guys are giving you good advice. I make it a plan to replace the gas tank (or at least have it boiled and sealed which often costs more than a new tank) and most other fuel related wear items with just about any old car I buy, most of them will benifit from it because tank rust and varnish build up is so common and can easily cause ongoing fuel contamination headaches.

If I were you I'd start shopping for a new tank, sending unit, assosiated small rubber lines & clamps, a new filter, and flush the heck out of the new fuel pump and carb (I'd probably tear down the carb again to be sure it's clean) that will likely end your problems, and if it turns out to be something else it sure wouldn't hurt in the long run to do it anyway.

Alright, so I am going to cut my losses right now and sell it. I don't have the money for all of this anymore. I've already put too much into the car to begin with, and it's nowhere near where I want it.

You're giving up that easy? Heck it's not that expensive, all in you'll probably only spend $300.00 or so, and that's a reach.

Try taking the two air mixture screws out spraying some carb cleaner down inside them. Blow some compressed air into the holes if you can.

Find another carb to borrow that you know runs right. This way you can isolate if it's the carb or dirt in the fuel system. Find another member who lives close to help you sort it out if you have to.

It does sound like a large vaccuum leak. Check the back of the intake manifold. I put an intake manifold on a small block one time and there was a space on the rear between the manifold and block. I did not notice it at first because when I first put the manifold on, in ran like a raped ape. About a week later it was acting exactly as you stated above. I replaced the car with one I knew was good and same thing. The firewall did not give access to see it. It was on a derby car (5th ave). When I cut the firewall out from the inside to make clearance for the dist, I could see it plain as day, part of the intake manifold gasket was missing. It was only a derby car so I wadded some RTV in there rather than replacing the intake gasket, problem solved. I am not saying this is the corresct way, but check the intake manifold gaskets. Don't over look the cheap fix.
Good Luck