I am not able to hear your truck's problem first-hand, but have you replaced the PCV valve on the rocker cover? I have had bump-sensitive and vacuum sensitive problems with them before. They are so cheap and easy to replace, it may be worth a look.
I am not familiar with the 22r carbs yet, so this might be off base, but I have run into similarr problems with other carbs when the float level was set too low or the inlet check valve was sticking. Might be worth a look if the other suggestions don't help.
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