Interceptor

Been living with this for a while now, but it's starting to spoil my riding pleasure, I have a '99 curvy, Just balanced the carbs, fitted new chain & sprockets, & blasted the carbs through with carb cleaner, I've looked at the search facility and am wondering if it's related to sticking choke plungers.... although I hardly ever use the choke, the idle fluctuates between 1000, and 1500 rpm but it's the low speed almost kangaroo like performance that is the most annoying, the midrange & top-end is fine...

any suggestions?

Cheers

John