First of all, Hello to everyone and thanks for having such an awesome site.

Ok, I picked up a trainer airplane at a local boot sale and brought it home. The plane came with a Tiger engine .40 installed and really the only things that were needed were electronics and fuel. I started the motor, tunned it on the ground (flat surface), and taxied it around. The engine has plenty of power, good acceleration. If you tilt the nose up around 15 degrees for a few seconds while the throttle is full open the motor almost cuts out. I am running 10% nitro and the glow plug is a brand new hot plug. I thought I had an air leak somewhere so I bought a new fuel tank, installed it and the same problem occurs.

Can anyone help? Any suggestions would be greatly appreciated. Thanks.