I thought that the moosing was accompanied with stalling, which I am not experiencing. This one has me scratching my head. I did the secondaries mod, adjusting the stop screw to keep them open a little. I thought that maybe that was creating turbulance in the passages. But with the noise 'on', I manually opened the secondaries, and there was no change in the sound. Then I thought maybe I got a gasket leak, but it's pretty hard to screw that up. I'll be eating those words later. I'll try the moosing fix. Keep you posted.
