[T Bird]

You say that you had your carbs apart 4 times, but don't say whether, or how, you set them up after you put them back together. If you removed the idle mixture screws and idle air correction screws to spray cleaner in the passages, you are going to have to set up the carbs from scratch. You should do the following, in this order:

--check/adjust float levels.
--check/adjust accelerator pump volume.
--equalize vacuum on each barrel. You do this by disconnecting the linkage between the L & R carbs. Now screw the idle air correction screws in all the way on one carb at a time. Determine which barrel draws the most air with a synchrometer. Then turn the other 2 idle air correction screws out until each barrel draws equal vacuum. Lock down the idle air correction screws and repeat the process for the other carb.
--balance vacuum between each carb. You do this by reconnecting the linkage and then adjusting the idle stop screws until each bank draws equal vacuum at idle. Check at 3000 rpm too. If vacuum doesn't balance at 3000 rpm, then the linkage needs to be adjusted. Make sure that you get vacuum to balance at the higher RPM. This is critical.
--adjust mixture screws at 1200 rpm.
--set idle speed to the recommended setting.
--recheck balance and mixture adjustments.

A book could be written on performing each of the above steps. You will need to get the car running so as to perform the balancing, mixture and idle adjustments.

Popping/stalling can be caused by a lot of things. You may have the idle mixture screws turned in too far and are starving the engine of gas. Try turning them all out about 2.5 turns from the fully seated position, as a starting point. Also, make sure that the o rings around the idle mixture screws are not broken. When you installed these o rings, you should have oiled them so that they seated properly and were not pulled into the threads and thus ruined.

If you can provide more specific details about what you did or didn't do to the carbs, some one here may be able to provide you with more detailed advice.

Good luck.
John