Well been a bit busy So I replaced the ecu and eeprom today still exactly the same Fuel filter replaced ,the pump was faulty so I had to put the original one back in
Valve clearance will close up when cold and increase when hot. If they are too tight the valves won't close properly and an engine might not even start or stall. If the engine gets hot enough, clearance is restored and it runs fine. That usually happens if new valve guides and seats are fitted which aren't seated right. Engine starts off ok but soon problems start. If the fuel pump doesn't cure it I would look at valve clearance again.
Fixed ! Went back to basics Checked the charging system Pulled every plug and cleaned the connections,still the same Removed to clean the new crank position sensor,it had 1 metal and two thin copper spacers I took one copper spacer off and it refitted and it cured it instantly I assume since the engine has been completely rebuilt it must have been at the maximum clearance and after 100 miles something must have settled and the gap became slightly too much ,the copper spacer was thin ,probably 1/2 mm at most
