Today was the first day in the mid 80's and all of my 2 stroke problems started. The main problem I am having is with a 6 month old Redmax 8000 blower.....when I start it up for the first 1-2 mins the the blower won't get more than 40% throttle and eventually will get to full throttle and runs perfect. The only thing that seems to make it run somewhat better is to pull the return line out of the tank and putting a screw into the rubber grommet. I have tried every different oils/fuel stations and grade without any improvements. What effects does heat have with fuel? Could the heat be causing vapor lock?