Hi, i have cleaned the carb pulged a new battery into the ignition, i have already fitted two new plugs. It was still the same. I have played again with the mixture. It is running ok ish on the ground, only missing every 10 seconds or so. I went down the flying field, just walked back in now. The engine is missing even more in the air. It does not stop, but missing every few seconds.

I have used all the fuel now so will get fresh fuel tomorrow and try that, but this fuel is only two weeks old.