I'm really new to this so bare with me. Recently my 103 will stall when I let off the throttle when approaching a stop sign or light. Once I restarted while still moving and once I waited to find neutral after I stopped. Motor runs fine, doesn't miss or hesitate otherwise. It has also started fluctuating in RPM at idle by 200-300 Rpm. Also has reved up to 1500-1700 at idle. All of this is just occasionally. Any ideas???