I have an old McCullouch Timber Bear. It has always run well until recently. It has become a bitch to start. I have to pull the plug and dry it every time. Then usually hit it with starting fluid. Once it's running, it runs fine and strong, idles well and all, but if you shut it off, it won't start again. I pulled the plug and cleaned it. It was wet with gas, but it didn't spray out of the plug hole when I cranked it sans plug. I pulled the carb and checked it. Clean and unclogged. The fuel line is new, full of fuel and its getting good spark. Not sure what to make of it. Thoughts?