My Echo backpack blower started to slowly lose overall power. Now at full throttle it still blows but it only feels like its at half or 3/4 power. I tried spraying Seafoam into the intake and it seems to do its cleaning then get the RPM's way up there for about 10 seconds then it just declines back to its troublesome ways. Blower is about 4 years old. Just changed the spark plug last year, banged out/cleaned out the air filter. Also checked the spark arrestor and the was crystal clear, no buildup at all. I've never winterized my 2 stroke machines, pretty much how I leave them after my last job of the year is how I pick them up at the beginning of the next season. Would it be cheaper for me to just buy a new carb or is there a simple fix?? I was thinking about buying a new spark plug, air filter, and gas filter to see if that helps at all. Any help would be appreciated.