My shindaiwa t344 string trimmer has started turning off when I give it gas. I let it warm up for a few and start to cut it will very shortly after just die out. I adjusted the idol speed pretty low and it is now cutting when throttle is only half open, wide open throttle runs... until it touches the grass then it dies. Adjusting the idol speed seems to help. Does anyone know what the problem sounds like. I would really appreciate your help and knowledge