I´ve just purchased the Virtualcol Saab 340 and here´s a strange problem: After take off with condition lever set to MAX the throttle slowly moves from take off power to idle at approx. 1000 feet. Nothing helps - not even hitting F4 or F3 constantly. It´rs not a problem related to the electric circuit: Battery and lights are on all the way...Any help is much appreciated - thanks an advance...

It sounds like the FSX autothrottle is being accidentally activated, and targetting a '0' speed.

Clearly the 340 does not have an autothrottle, but if somehow FSX's default A/T command is being activated, then it could still apply an autothrottle to this aircraft.

Are you using the default TOGA command in FSX with this?  ....