Q:Model is flying like mad ???

[ebrowser]

I have been working with my 1st model now, and I test it in FS2002.
But when I released the parking brakes, the jet pitched up SUDDENLY as if I pulled back the stick!In fact, I did nothing.
And then, it kept pitching up. In the end, it flew up and down in the sky, just like a bottle thrown in the air! God !!
All that I can do is to reset the game.
What's wrong with my model(or the cfg) ?  

[pete]

What aircraft did you base the model on when you exported it from FSDS/Gmax?

[ebrowser]

That's a jet fighter, a Mig.
I use Gmax.

Maybe the figures I set in the aircraft.cfg isnt correct ??
I just use FSEdit to modify that cfg file, and there're so many items in 'Flight Dynamics'...