Good call. I recently cleaned the filters, so I doubt that's the problem. I turned my a/f screws a quarter turn out, and it feels a little better, but still surging. Next I went out and bought some vacuum gauges. When I went to balance the carbs I discover that my carbs don't have an adjustment screw where the service manual says it should be. In fact my carbs look just like the pics in the manual except for the adjuster. Anyone know where that sucker is located?