Got a mower that looks like its been pretty abused tryed to get it running but it never stays running. its a Murry with a 5hp b&s engine throttless carb. so far triedNew gas, cleaned tank, cleaned and rebuilt carb, new air filter, new spark plug, changed oil, but will not start unless starter fluid/wd40/carb cleaner or if gas is dumped into carb but then dies, although will run consistantly with wd4o sprayed continously into carb. Any ideas?