my s2 has been sat over the winter ive now fitted a gotech it will start and run but only for a few seconds at a time, it also misfires as if its lean the only idea i have is that the fuel pump is priming but not pumping when the engine is running so it will run until the fuel rail is empty?it stalls if you increase the throttle and wont idle, i can hear the pump prime im just stuck for ideas?

joe