I have a high hanging idle issue on a bike. When the bike is cranked, I release the choke and it idles down. If I touch the throttle it hangs for a few seconds then eventually idles down. If I click it in gear it will also idle down when it has a load on the engine. It has a new throttle cable, fuel air screw and choke plunger. The slide doesn't seem to be roughened hanging up.....any ideas?