Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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If you can get it to start and run then I would suggest running SeaFoam through it. This would require that the engine will start. You will just add a couple ounces of SeaFoam to the fuel that is in the tank and run the engine until that tank of fuel is gone. The SeaFoam will help to clean the carburetor as it is running, it also acts as a stabilizer as well so that there would be no need for a separate stabilizer to be added. Since it is starting at times then it can't be anything too serious wrong.
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Yes, most any auto supply store or farm and fleet store will carry it.
Then I would remove the bowl from the bottom of the carburetor and drain the old fuel, while you have it off make certain to clean the small holes in the bolt/nut that holds the bowl on. This should solve the starting/running issues that you are having.
I doubt that the spark plug would be an issue since you just recently replaced it. However it would be a really easy thing to check if you suspect it to be a problem. You can always replace it and see if it solves your problem.
The only good way to check that is to replace it, there are a lot of different reasons as to why a spark plug may not function properly. It is hard to look at a spark plug and tell if it will work correctly or not therefore I normally suggest to replace it with a new one and then there should be no doubt about whether it will work or not.