Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Mark, thanks for your response. I do believe that the surging is caused by your carburetor starving for fuel. You very likely have either a clogged jet, or fuel passage inside your carburetor body.
You will likely need to clean your carburetor, in order to resolve our problem.
There is a fuel additive available that may work for you. I would give it a try first. If it does not work, then I would consider cleaning the carburetor.
The fuel additive is called Mechanic In A Bottle.
Mechanic In A Bottle - Click Here
Please click on the link above. A page will open, that will give you specific details relating to this product.
All mufflers will glow enough to be noticed at night. I would consider this to be normal. Give the fuel additive a try first, and let's see if it resolves our problem. If not, you will need to do some more detailed cleaning.
You can purchase the product at Home Depot, or Tractor Supply. I have seen it at Sears also. In my area, it is $5.99 per bottle.
You are very welcome! I hope you and your family have a Merry Christmas, as well. I do hope all goes well for you.