I just "helped" a family member out who needed some cash by purchasing his 2000 zr 500. It wont run! He had the stator replaced and the efi box, ran great and then it just died. It will barely idle now and wont rev up. Its getting great spark on both cylinders and will run fine on one with the other plug removed. It seems that the one cylinder isnt getting any gas, could this be a bad injector? I dont really know any of the sleds history other than the parts he had replaced, any ideas?