Engine Surge While Stopping

i have edelbrock 1406 on my 80 ramcharger and 70 dart, both are mechanical secondaries and open when i move the linkage

agree with other loosen the carb mounting bolts and lift the carb up a lil to see if it frees up, also check the linkages for bent rods etc i had a large buddy lean on my air cleaner and my throttle stuck open when i gave it gas to fire up (pulled pedal up with my foot so no harm done)