Got a Stihl br400 blower off ebay from Jewels & tools...blower looks good but when run at full throttle it bogs...not to the point of the engine cutting off. I have tried cleaning the carb and have not yet checked the fuel lines. One thing I noticed was when I took off the air filter while running their was a decent amount of fuel/oil mist shooting out of the air filter housing. Is that normal? should I rebuild the carb? it idles fine, low throttle operation fine & mid throttle it operates and sounds normal. Its only when put to full throttle that it bogs to the point of almost shutting off. any idea?