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My mower will run fine while the blades are engaged, but when the bail is released and the blades stop, the engine will sit there and surge. I have used fresh gas and used a little seafoam, but since the engine runs fine when the blade is engaged, it just seems to me that this is not a fuel issue. Also this only does it when the engine is warm. For example, when the engine is first started, it runs fine. Once I mow a little bit and stop to empty the first bag, it will surge.

the idle jet is obstructed

Jenebo said:

and used a little seafoam

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So that is not working for you.

I would dump and clean out the fuel tank. Install new fuel lines and filter. Boil clean the carb.

As Bert said, idle circuit clogged . So low load surges, blade on, high load is fine. Blade on, the engine is on the main jet.