Not sure what happened, but suddenly every time I start up the Pilatus PC-12 engine from cold and dark in FSX the throttle sticks and the airplane shoots forward with the parking brake on. Sometimes I can get it to go back to normal but most of the time it just stays at 100% throttle. what happened? How can I fix this? Reinstalling did nothingThanksDavid

I was running into this problem myself, learning the ins and outs of turbo prop aircrafts. The problem for me was that I was forgetting to disable the starters after the engines fire up - the starter is capable of spinning the props fast enough to move the plane (in the sim anyway, not sure about real life). Maybe that's what happened to you?

I have had the problem of runaway engine on start up with the F1 PC12 both in the previous and current versions of FS. The only workaround I have found is to turn the "mixture control" or "prop condition lever" to the cutoff position when the engine starts to runaway this will kill the engine. As it starts to wind down I open up the "Prop Condition lever" and the engine will start for a second time however the engine doesn't run away but will stabilise at normal idle RPM and, as a consequence, the Aircraft does not start to roll forward.