Thanks. I have set AI settings back to default. I removed all mods. And I tried reversing throttle axis. Nothing has worked. I have been able to reproduce the issue with other planes, so it’s not just an issue with the 172. I checked all keyboard and controller bindings to ensure nothing else was conflicting with the throttle. I tried disconnecting my Logitech and using my Xbox controller, and also tried a Saitek. Same issue. Just for the heck of it I made a quick video showing exactly what’s happening. You’ll see full throttle, then - on it’s own - you’ll see it go to idle. After that it immediately goes to idle as soon as I move to full throttle. Sometimes it’s a slower response. I can even take off sometimes - then it goes idle and sad things happen! Maybe I should take MSFS completely back to default settings? Here’s the video for anyone who wants to see, although it sounds like you all have a good idea of what’s happening.