Picked up a 260 trimmer with about 10 hours use on it. It was bought by the orignal owner last fall, used to clear out an area, then put away till I came along and bought it. Idles fine, and if I can get it to full throttle, runs fine. If I start from idle and try to slowly increase the throttle she starts to bog down and will die out unless I back off completely or gun it. Sometimes it won't even make it to full throttle if I gun it. I replaced the air filter and plug, same result. As far as I can tell there isn't a carb adjustment screw on the unit, only an idle screw. I can't imagine the carb would already be hosed, but maybe. Any suggestions are much appreciated.