If sea foam helped I might try a full decarb as prescribed here and in other places...easy to do. Then a carb job if that didn't help. Could be a small piece of trash in there around that never passes or causes major trouble, but gets in a position to cause a stumble now and again. Those would both be pretty easy and cheap. Might also check the linkages as as you throttle up and down...unlikely but could check. Might get you started. A prob like that is hard to diagnose.
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"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15