i have one hooked up and have noticed an odd needle behavior that i am wondering if anyone else has seen. at wide open throttle, or nearly so, i notice the vacuum gauge flutters across a range of 2-4 inches of vacuum. if i push the gas just a little more, it quits fluttering and i am usually pegged at 0 inches. backing off the gas usually brings back the flutter until i am not under so much load, usually at a vacuum of 5-7 inches. what does the fluttering translate to? i was thinking maybe it was a point where the valves are just not keeping up with the demand as much, maybe bouncing? any ideas? know where i might be able to find some answers?