2003 Busa - 4000k's - Recently engine will idle, OK then (stutter) and sound & FEEL like she's running on 3 NOT 4. On changing down gears to pull up at lights etc engine will occasionaly completely CUT OUT! Will restart OK. No probs with Top End grunt - but this idling issue & cutting out has Suzuki mechanics baffled. Have been using correct fuel - even went to Caltex Vortex as advised by Suzuki. NO F1 light issue. Could this be electrical - eg related to a wiring problem perhaps with side stand, kill switch or clutch OR does it sound like a fuel system issue? Two weeks off the road already & going STIR crazy. Any ideas, views & comments appreciated.