I have a 1994 Yamaha big bear 350 4x4, it sat for maybe a year, so i recently got it running and it sounds good but when im in neutral and i rev it a little and let off the rpms will stay the same or go higher and will eventually come back down slowly, the cable isnt sticking, and i have cleaned the carb as much as i can from the spray to the fuel additive to clean it, any advice will help thanks!