Kind of surprising, with cars this old I've seen a lot of them suffer from high idle due to internal vacuum leak. Fuel trims look fine but the cold start valve just wore out from all the heat cycles and won't close up all the way. Rather notorious issue in some models of the Toyota 4Runner:
I feel like the rpm the torque converters are set to also probably match the factory power output and turbo etc. Also considering component wear and longevity for warranty purposes.
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