I have a 1985 Toyota with the stock 22r engine and carb setup. I had some major problems about 6 months ago with the oringinal carb and after a shop worked on it for a week and could not resolve the the problem I purchased a used carb off of ebay and dropped it in and the truck has been running great ever since.

Then about a week ago I was driving a long and took my foot off the gas to stop at a light and it cut off. I roll started it and then it cut off again. I had to keep my foot on the gas to keep if the idle from dropping so low that it would just cut off. It runs great when I am on the highway or driving a long but as soon as I take my foot off of the gas it cuts off. After about 2 days of this it now will not start at all unless I pour some gas in the carb. It will start fine then but same problem as before it will not continue to idel unless I keep my foot on the gas.

I pulled the carb off and rebuilt it but nothing changed.

I am at a loss for the next step.

Thoughts that I have.
Its not the fuel pump as it will run after it gets started, so the carb is getting fuel.
Its not the fuel filter for same reason as above, although this is the next thing and probablly should have been the first thing I replaced. I replaced it when I was haveing the problems with the oringal carb.

Any ideas or suggestions would be greatly appreciated.