Ok I am about nuts over this. I have had lots of experience with engines. I have a Super Tigre 90 in a Great Planes Extra 300. Starts fine. Runs great for about 5 min. Then it throtles down to just above idle and the plane comes down. I have made perfect landings and the plane is sitting on the runway idleing. Thinking the tank was getting vapor lock I dismantled it and it did the same thing. If it is overheating will it idle down like this or just shut off? Guys at the field are all scratching their heads too. Anyone want to take a shot at this?