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So I did this and it ran with the left side unplugged, not with the right. Pulled the plugs and the right one is black, left one still looks new.

The traction belt has been replaced, arm seems fine. The engine actually seems to struggle when in drive. Sounds fine in neutral though.

I have a Z445 with Briggs & Stratton engine. It recently had a surging issue, but I took apart and cleaned the carb, which fixed that problem. Now the engine sounds fine in neutral but when moving, it seems to run more slowly than it should. Has new spark plugs, filters (air, fuel & oil), oil...