yup yup had it tuned before the fuel change and the fuel change was a mistake so I went to the original fuel (Blue Thunder), aand it cranks and idles now but wont go far if it moves at all and when I pull th trigger (brake) it shuts off. I think it might be the idle screw but that still doesnt explain why if i hold it full throttle it only inches by and spews gas out of the muffler.