I have been noticing when I'm traveling 65-75 for awhile, and come to a stop, like coming off the interstate, that my idle, which normally sits around 900-1000, goes to about 5-600 RPM and hangs there, then after about a minute or two starts to creep back up to normal. When this does this, if I blip the throttle a couple times it usually corrects itself. It runs fine w no backfiring or anything like that. Is this normal for the bike to do this? Bike is 2003 Ultra. 88cid.