make sure the eddy spring tension is not stuck on the throttle shafts

make sure it not hitting/hanging up on the intake at the carb base

I had trouble with one hitting the choke well and had to use a 1" spacer to lift the carb so linkage would clear

what he said on throttle cable

unhook it and try

the choke linkage and fast idle cam is out of wack maybe

manual curb idle screw is not in to far correct?

seems odd 2 diff style carbs do the same thing,make me think its something mech or a vac leak

pcv hose tight,missing a cap on vac port???

plug in the back for the brake vac port

brake vac booster good and not leaking??