Recently my k6 has developed a habit of not returning to idle speed as quickly as usual after getting off the throttle. Seems to happen only when hot and, for example braking for traffic: RPMs remain above, say 2500/3000 and drop very slowly to idle speed, not returning to 1100-1300 until a few seconds after coming to a stop. TBs are synced, rubber boots are tight, secondaries look the same, valves properly adjusted, new air filter, fresh fuel, throttle linkage adjusted correctly and idle speed within proper limits. Other than this problem the bike runs great. I'm thinking possible vacuum leak in the TB sync hoses I added about 60k miles ago ...or... air temp sensor, as it seems to occur more often in cold temps. Any thoughts?