Got a new echo 260s string trimmer this spring and since day one I have to wait about 45 seconds to one minute, maybe a little longer, for it to warm up ( it will die when I give it gas) even if I just used it ten minutes ago. I have tried adjusting idle screw and checked exhaust port screen. I have two echo 2100's over four years old and have never had this problem with them( fire them up and go immediately). Once I get the 260 going it runs great but in the time it takes for it to warm up I could have blown off half of a small residential property. Any suggestions?