i'm running an evolution 46nt in a hangar 9 pulse using 5% non branded fuel and the original glow plug.

I ran good when new got a couple of flights out of it but then started to get problems. When you full throttle nothing happens and then after a few seconds it speeds up then tries to cut catch it and the same cycle happens again and we seem unable to tune it.

I noticed a split in the pipe to the carb so replaced this with a similar dia pipe and looked like it was sorted, stated first time would go to full throttle ok, but first flight out engine tried to cut on take off not 10 feet of the gound then had no full throttle but idles nice.
can anyone help as i'm tearing my hair out, could it be the fuel, we've had the tank out made sure the fuel is not foaming checked the other fuel lines and the plug looks ok.