check the antropomorphic control in realism settings. If it is enabled you cannot control different things at the same time e.g flap and throttle. If you have flap assigned to a axis which is not steady, it might activate the antropomorphic control when not touched.
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Intel Core i7 920 @3.4 | Asus P6T SE | 6GB DDR3 | ATI Radeon HD 5870 1GB GDDR5
Widows 7 x64 SP1
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