I have a 2007 3010 gas Mule. Problems include: 1) when engine is running and in gear the machine will go very slow( wether in slow or fast or 2 vs 4 wheel). 2) When I remove the carborator (sp?) cover and disconnect the air vent tube, the motor runs better but still no full speed power. I have replaced the fuel, added heat, added gas treatment, replaced 1 of two spark plugs. I am at a loss. Would rather not take it to a local dealer due to their seedy reputation. Any help please and thanks.