FS9 throttle problems

Hi there,Sorry if this is the wrong forum to post this in, but the general one is so fast moving that nobody gets to read it.I was flying nicely in my F1 c152 yesterday and did an ok landing. I stopped the plane on the runway and without me touching a thing, the plane throttled up to max power by itself! So i moved the throttle forward and back to idle and the power decreased but almost immediately returned to full power again.I've tried closing and reopening FS9, restarting windows, i've tried default planes, add on planes, different airports and even disable the joystick but i just can't get anything to stay at idle power.As far as i'm aware i did nothing to start this happening and i really don't want to reinstall FS!I have CH Products 3-lever USB yoke, USB pedals and Thrustmaster HOTAS Cougar all connected, but as i said, the problem is there even with these disabled.Thanks for any clues, Mark.