I have a 2003 Walker MT GHS, I just purchased it and it was okay the last two days I have noticed that when I shut it off it knocks and some times back fires. I have new oil in it and new air filter. I am taking it in for service it needs a new gear box. And I change to a higher octane gas. Any help would be great a the mower seems to have a hard time getting up hills when cutting. Thank you
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