If I understood correctly your origional plug was replaced due to the missing, you installed a new plug and had the same problem, than you went back to the old plug and it was fine. From what you have described the carb is clean and the choke operates. I do not recall but did you replace the fuel in tank?
Make sure you have good fuel in the tank, two weeks is all it takes for the fuel with ethanol to start going bad, than check to make sure your plug is at the proper gap, than check your valve clearence. And check for vacume leaks at the manifold. Once all these are confirmed to be correct we can go on trouble shooting if the problem still exists. Their can be so many differant things to cause the problem you have so you have to start with the easiest first but it is important to make sure what you checked is good cause if you miss one thing and continue on it will all be in vane.
Tom
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