[PeterD]

I have one little problem.
Every time i increase the power at all, the engine turns off. No fire or anything, and it doesnt matter how much or how slowly i increase the power, but no engine.
Its fine decreasing the power though...

You haven't used the P-80 much I guess. It's a "feature" of the P-80 engine (which this aircraft uses, read the first post in this thread). You can overcome this by running it at 99% or just up to 100%, if you try to go past 100% it will most likely shut down.