Make sure the fuel lines are good. If suspect, replace with new line, it's inexpensive.
thanks,

I have had a Homelite blower for almost 20 years and never a problem until last fall when leaves began falling. Then it began to act similar to the way you describe except for blowing bubbles in the tank. It would run at full speed when first started then begin to run erratically and lose RPMs and finally shut down. I tried several things, mixed fresh gas and oil, cleaned the air filter, checked the fuel line, etc, but nothing helped until I tried adjusting the carburetor. The adjusting screws have plastic seals which limit how far you can turn them in either direction, but I had to remove those seals to get enough turning space to get it running properly. After adjusting the air/fuel mixture it ran fine for the rest of the season. I'm not saying that your blower's problem is caused by the same thing as mine was, and it may not be advisable in the long run to remove the adjustment screw limits. I'm just saying what worked for me when I got to the point that I was willing to try anything, and if I ruined the old blower I would buy a new one. Taking it to a small engine repair shop around here would have cost almost as much as a new one.