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I recently revived this puppy after it sat for a couple of seasons. Started on second pull. However, it has kind of a rollercoaster idle. Steady power when I hit thicker grass. I’m guessing a carb issue?

Seeing that you don’t supply us with a model number, I suspect you have a model D engine. I agree,probably a fuel issue. Here is a manual which may help you out. https://lookup3.toro.com/ttcGateway/acrobat/manuals/lball.html