Could you give me the flying conditions you were in. As much detail as possible. There are a couple of gauge issues that I have actually fixed a couple of weeks ago, but there are still 2 or 3 other issues that are being a bit stubborn. Also, just a shot in the dark, but was your mixture set correctly? If you're at a reasonably high altitude, and air pressure is lower than normal, having a Full Rich mixture setting will drop the engines power. In some cases, it will also stall the engines.