stuttering at low rpm's

[Gnasher]

The plungers or stater plunger to give them their proper name, don't move that much and it only takes a few mm, try pushing each one back with something.  They unscrew from the body and can be stripped they have a plunger, spring, oring and body, mostly the oring fails and moisture gets in casing them to seize.  You don't have to strip the cabs to get at them, just remove the tank it's fiddly but possible, or just remove the carb bank.