When the engine gets warm, occasionally the engine cuts out, it pulls back and jerks as if it has a fuel blockage. This happens as soon as the engine gets warm, if you rev it for a while it runs ok again for a little while and then starts pulling back again. you can be travelling down the dual carriage way at a steady 55mph and it will just start to cut out on you.
It has had new spark plugs, air filter and fuel filter,