I agree with mudshed .checkem.. however, your situation was same as mine ...motor is very tight mine would stall on takeoff idele fine but try to take off and would die, lean our lsn a little , at about tank 4 this helped a lot ... but by tank 6 or 7 as the motor loosened a little the symptom you describe disapeared and i tuned for speed and the thing has performed like magic since.