I have an almost new 3w-100. I flew it the other day and the problem is: I tune it on the ground and it runs awesome, great idle, transision, power, everything. But in the air it will barely keep running. It even died on me in flight. I've adjusted the needles all over the place with the same symptons. Great on the ground, bad in the air. I have soldered a vent line to the diaphram cover with a vent line ran into the fuse, but it didnt help.
Whats going on here???