I installed a velocity stack on my g-62 and although the engine seemed to be running fine on the ground as soon as I was airborn the engine ran erratically. I figured it musta been running rich now since the stack is supposed to keep fuel from being sucked out of the carb venturi via the air passing over it.

My question is: How do you set the needles while the plane is on the ground since it seems that the engine runs differently once the plane is flying?

Also .... my stack is cut at an angle, should the longest end of the angled stack face to the front of the plane or the back?

Thanks,
Chuck