put new throttle cabel on and when L called R-R he asked long or short not shure so bought long one now if it is adjusted to low rpms has about 3/16 th of an inch to max out but if a move the cable where it will top out its to high for idel rpms to high will grind when changeing forward to reverse or if not holding laderals will go by itself could it be the wrong cabel its the one that runs down under all the way to back or tud then comes up ?????