Put a new glow plug in it, even if the one already in the engine seems fine. Try turning the high speed needle in 1/8 turns at a time until it stays running when you apply the throttle. If the engine has a hard time running at idle, turn the idle screw counter clockwise (small turns) until the rpms pick up enough to keep it running. Is this a new engine? Has it been broken? Has it been over heated? I couldn't find the factory needle settings for this particular engine. Hope this helps.