OS Engines FS-91SII-FI Fuel Injected Test Run

I finally acquired an OS FS-91S in the Fuel Injected version. There were not many of these made, and I've never seen one run or fly. The setup was not complicated, but it does require a servo to control the throttle and a radio to test run the engine. I used fuel without nitromethane and I think this lead to the engine running at the very lean limit of what the control allows. The surging might be due to reaching the lean fuel trim limit. Running the engine is uneventful. Apply plug heat and crank. It just starts. Slamming the throttle open seemed to cause it to stumble sometimes, but I'm not sure why. I'll definitely be flying this engine in a few months. After rereading the manual, I think I misinterpreted the function of the LED on the ECU while the engine is running. When I get this installed in an airplane I'll record another video.