My system is loaded with CFS1, CFS2, and FS9.       Add-ons are CH Flight Yoke, CH Throttle Quadrant, and Saitek Joystick.      All have worked normally for years.       Recently, in FS9, the throttle control on both the CH Quadrant and the Saitek has become unreliable in that, with full power set and without changing the throttle setting, the manifold pressure drops to about 50% and further movement of the throttle control has no effect on the manifold pressure.      In CFS1 and CFS2, the Saitek throttle control operates normally.         I have calibrated both the CH Throttle Quadrant and the Saitek joystick and both appear to calibrate successfully.       I have un-installed FS9 and re-installed with the update and with no add-ons, but the throttle problem remains the same with both the CH and the Saitek controllers.   Does anyone have any advice to offer?