Thanks (both of you!)

My idle speed is reasonably high I think - and besides I wasn't trying to drop to idle but around a 1/4 - 1/3 throttle when it cut. I will try richening it up some since it sounded like a lean cut. If that doesn't work I'll go find some feeler gauges - first time I've heard that idea but it sounds like a consistant way to set things up...