First, let me say I have read the manual and if this is covered, I obviously missed it then. Here is my situation, whenever descending through the clouds in cold weather, I am losing my speed very quickly. Right now, there is some very bad weather I have been flying in the US. I have made sure that my throttle is at full and I still am experiencing it. All the settings are where they should be also (torque, etc). I have put ice protection on to prevent the ice from building on the wings but my speed basically disappears if I stay in the clouds too much. I was recently flying at 5,000 in the clouds for a bit and I had to drop down to 2,000 out of the clouds to prevent my plane from stalling. Once I got out of the clouds, my speed increased! Any help would be greatly appreciated. John