My last three roads glides have done this. A 2007,2010 and the 2011. Taking the 2011 in for the 1000 mile in the morning. Dealre tighened the steering head bearing on the 2007 and it fixed it. Ignored the 2010 will see if the problem can be corrected on the new one. Only notice it when you roll on the throttle then let off then turn loose of the bars. The 2011 showed up at about 700 miles. Noticed that I am missing the center wheel weight in a group of three. May be that is the problem. Also the trottle is hanging up and you can feel a light tingle of electricy on your left hand if you do not wear gloves. The gps may mount may have a bare wire.