I have a modified 77 carb with electric choke. The fast idle cam hangs up and does not fall off with choke warmed up. If moves freely by holding the. Home open so I can not see bind. . Even when you rev it several times it does not release. If you click it with your finger it.fslls off. Leaning and lubing have not helped. Choke for lr lean does not change problem . ,ideas?? Thx